diff --git a/src/bin/keycloakify/generateResources/generateResources.ts b/src/bin/keycloakify/generateResources/generateResources.ts
index 4b3881a0..ac2d6ca5 100644
--- a/src/bin/keycloakify/generateResources/generateResources.ts
+++ b/src/bin/keycloakify/generateResources/generateResources.ts
@@ -37,10 +37,10 @@ import {
 } from "../../shared/metaInfKeycloakThemes";
 import { objectEntries } from "tsafe/objectEntries";
 import { escapeStringForPropertiesFile } from "../../tools/escapeStringForPropertiesFile";
-import * as child_process from "child_process";
 import { getThisCodebaseRootDirPath } from "../../tools/getThisCodebaseRootDirPath";
 import propertiesParser from "properties-parser";
 import { createObjectThatThrowsIfAccessed } from "../../tools/createObjectThatThrowsIfAccessed";
+import { listInstalledModules } from "../../tools/listInstalledModules";
 
 export type BuildContextLike = BuildContextLike_kcContextExclusionsFtlCode &
     BuildContextLike_generateMessageProperties & {
@@ -238,9 +238,9 @@ export async function generateResources(params: {
 
         let languageTags: string[] | undefined = undefined;
 
-        i18n_messages_generation: {
+        i18n_multi_page: {
             if (isSpa) {
-                break i18n_messages_generation;
+                break i18n_multi_page;
             }
 
             assert(themeType !== "admin");
@@ -257,23 +257,43 @@ export async function generateResources(params: {
                 writeMessagePropertiesFiles;
         }
 
-        bring_in_account_spa_messages: {
+        let isLegacyAccountSpa = false;
+
+        // NOTE: Eventually remove this block.
+        i18n_single_page_account_legacy: {
             if (!isSpa) {
-                break bring_in_account_spa_messages;
+                break i18n_single_page_account_legacy;
             }
 
             if (themeType !== "account") {
-                break bring_in_account_spa_messages;
+                break i18n_single_page_account_legacy;
             }
 
-            const accountUiDirPath = child_process
-                .execSync(`npm list @keycloakify/keycloak-account-ui --parseable`, {
-                    cwd: pathDirname(buildContext.packageJsonFilePath)
-                })
-                .toString("utf8")
-                .trim();
+            const [moduleMeta] = await listInstalledModules({
+                packageJsonFilePath: buildContext.packageJsonFilePath,
+                filter: ({ moduleName }) =>
+                    moduleName === "@keycloakify/keycloak-account-ui"
+            });
 
-            const messageDirPath_defaults = pathJoin(accountUiDirPath, "messages");
+            assert(
+                moduleMeta !== undefined,
+                `@keycloakify/keycloak-account-ui is supposed to be installed`
+            );
+
+            {
+                const [majorStr] = moduleMeta.version.split(".");
+
+                if (majorStr.length === 6) {
+                    // NOTE: Now we use the format MMmmpp (Major, minor, patch) for example for
+                    // 26.0.7 it would be 260007.
+                    break i18n_single_page_account_legacy;
+                } else {
+                    // 25.0.4-rc.5 or later
+                    isLegacyAccountSpa = true;
+                }
+            }
+
+            const messageDirPath_defaults = pathJoin(moduleMeta.dirPath, "messages");
 
             if (!fs.existsSync(messageDirPath_defaults)) {
                 throw new Error(
@@ -281,6 +301,8 @@ export async function generateResources(params: {
                 );
             }
 
+            isLegacyAccountSpa = true;
+
             const messagesDirPath_dest = pathJoin(
                 getThemeTypeDirPath({ themeName, themeType: "account" }),
                 "messages"
@@ -342,14 +364,20 @@ export async function generateResources(params: {
                 );
         }
 
-        bring_in_admin_messages: {
-            if (themeType !== "admin") {
-                break bring_in_admin_messages;
+        i18n_single_page: {
+            if (!isSpa) {
+                break i18n_single_page;
             }
 
+            if (isLegacyAccountSpa) {
+                break i18n_single_page;
+            }
+
+            assert(themeType === "account" || themeType === "admin");
+
             const messagesDirPath_theme = pathJoin(
                 buildContext.themeSrcDirPath,
-                "admin",
+                themeType,
                 "i18n"
             );
 
@@ -423,7 +451,7 @@ export async function generateResources(params: {
 
                 propertiesByLang[parsedBasename.lang] ??= {
                     base: createObjectThatThrowsIfAccessed<Buffer>({
-                        debugMessage: `No base ${parsedBasename.lang} translation for admin theme`
+                        debugMessage: `No base ${parsedBasename.lang} translation for ${themeType} theme`
                     }),
                     override: undefined,
                     overrideByThemeName: {}
@@ -446,7 +474,9 @@ export async function generateResources(params: {
                 ] = buffer;
             });
 
-            writeMessagePropertiesFilesByThemeType.admin = ({
+            languageTags = Object.keys(propertiesByLang);
+
+            writeMessagePropertiesFilesByThemeType[themeType] = ({
                 messageDirPath,
                 themeName
             }) => {
@@ -456,8 +486,6 @@ export async function generateResources(params: {
 
                 Object.entries(propertiesByLang).forEach(
                     ([lang, { base, override, overrideByThemeName }]) => {
-                        (languageTags ??= []).push(lang);
-
                         const messages = propertiesParser.parse(base.toString("utf8"));
 
                         if (override !== undefined) {
diff --git a/src/bin/own.ts b/src/bin/own.ts
index 83f3b6be..802e01fa 100644
--- a/src/bin/own.ts
+++ b/src/bin/own.ts
@@ -124,8 +124,7 @@ async function command_own(params: Params_subcommands) {
     ] of targetFileRelativePathsByExtensionModuleMeta.entries()) {
         const extensionModuleDirPath = await getInstalledModuleDirPath({
             moduleName: extensionModuleMeta.moduleName,
-            packageJsonDirPath: pathDirname(buildContext.packageJsonFilePath),
-            projectDirPath: buildContext.projectDirPath
+            packageJsonDirPath: pathDirname(buildContext.packageJsonFilePath)
         });
 
         for (const fileRelativePath of fileRelativePaths) {
diff --git a/src/bin/sync-extensions/extensionModuleMeta.ts b/src/bin/sync-extensions/extensionModuleMeta.ts
index 3cc7d8d3..124d1e69 100644
--- a/src/bin/sync-extensions/extensionModuleMeta.ts
+++ b/src/bin/sync-extensions/extensionModuleMeta.ts
@@ -109,7 +109,6 @@ export async function getExtensionModuleMetas(params: {
     const installedExtensionModules = await (async () => {
         const installedModulesWithKeycloakifyInTheName = await listInstalledModules({
             packageJsonFilePath: buildContext.packageJsonFilePath,
-            projectDirPath: buildContext.packageJsonFilePath,
             filter: ({ moduleName }) =>
                 moduleName.includes("keycloakify") && moduleName !== "keycloakify"
         });
diff --git a/src/bin/tools/getInstalledModuleDirPath.ts b/src/bin/tools/getInstalledModuleDirPath.ts
index 7915e6e9..4335fe38 100644
--- a/src/bin/tools/getInstalledModuleDirPath.ts
+++ b/src/bin/tools/getInstalledModuleDirPath.ts
@@ -2,40 +2,42 @@ import { join as pathJoin } from "path";
 import { existsAsync } from "./fs.existsAsync";
 import * as child_process from "child_process";
 import { assert } from "tsafe/assert";
+import { getIsRootPath } from "../tools/isRootPath";
 
 export async function getInstalledModuleDirPath(params: {
     moduleName: string;
     packageJsonDirPath: string;
-    projectDirPath: string;
 }) {
-    const { moduleName, packageJsonDirPath, projectDirPath } = params;
+    const { moduleName, packageJsonDirPath } = params;
 
-    common_case: {
-        const dirPath = pathJoin(
-            ...[packageJsonDirPath, "node_modules", ...moduleName.split("/")]
-        );
+    {
+        let dirPath = packageJsonDirPath;
 
-        if (!(await existsAsync(dirPath))) {
-            break common_case;
+        while (true) {
+            const dirPath_candidate = pathJoin(
+                dirPath,
+                "node_modules",
+                ...moduleName.split("/")
+            );
+
+            let doesExist: boolean;
+
+            try {
+                doesExist = await existsAsync(dirPath_candidate);
+            } catch {
+                doesExist = false;
+            }
+
+            if (doesExist) {
+                return dirPath_candidate;
+            }
+
+            if (getIsRootPath(dirPath)) {
+                break;
+            }
+
+            dirPath = pathJoin(dirPath, "..");
         }
-
-        return dirPath;
-    }
-
-    node_modules_at_root_case: {
-        if (projectDirPath === packageJsonDirPath) {
-            break node_modules_at_root_case;
-        }
-
-        const dirPath = pathJoin(
-            ...[projectDirPath, "node_modules", ...moduleName.split("/")]
-        );
-
-        if (!(await existsAsync(dirPath))) {
-            break node_modules_at_root_case;
-        }
-
-        return dirPath;
     }
 
     const dirPath = child_process
diff --git a/src/bin/tools/isRootPath.ts b/src/bin/tools/isRootPath.ts
new file mode 100644
index 00000000..0fec5264
--- /dev/null
+++ b/src/bin/tools/isRootPath.ts
@@ -0,0 +1,22 @@
+import { normalize as pathNormalize } from "path";
+
+export function getIsRootPath(filePath: string): boolean {
+    const path_normalized = pathNormalize(filePath);
+
+    // Unix-like root ("/")
+    if (path_normalized === "/") {
+        return true;
+    }
+
+    // Check for Windows drive root (e.g., "C:\\")
+    if (/^[a-zA-Z]:\\$/.test(path_normalized)) {
+        return true;
+    }
+
+    // Check for UNC root (e.g., "\\server\share")
+    if (/^\\\\[^\\]+\\[^\\]+\\?$/.test(path_normalized)) {
+        return true;
+    }
+
+    return false;
+}
diff --git a/src/bin/tools/listInstalledModules.ts b/src/bin/tools/listInstalledModules.ts
index d173c73c..dcd107d3 100644
--- a/src/bin/tools/listInstalledModules.ts
+++ b/src/bin/tools/listInstalledModules.ts
@@ -8,7 +8,6 @@ import { exclude } from "tsafe/exclude";
 
 export async function listInstalledModules(params: {
     packageJsonFilePath: string;
-    projectDirPath: string;
     filter: (params: { moduleName: string }) => boolean;
 }): Promise<
     {
@@ -18,7 +17,7 @@ export async function listInstalledModules(params: {
         peerDependencies: Record<string, string>;
     }[]
 > {
-    const { packageJsonFilePath, projectDirPath, filter } = params;
+    const { packageJsonFilePath, filter } = params;
 
     const parsedPackageJson = await readPackageJsonDependencies({
         packageJsonFilePath
@@ -36,8 +35,7 @@ export async function listInstalledModules(params: {
         extensionModuleNames.map(async moduleName => {
             const dirPath = await getInstalledModuleDirPath({
                 moduleName,
-                packageJsonDirPath: pathDirname(packageJsonFilePath),
-                projectDirPath
+                packageJsonDirPath: pathDirname(packageJsonFilePath)
             });
 
             const { version, peerDependencies } =