diff --git a/main.js b/main.js
index 49508a4..66ff328 100644
--- a/main.js
+++ b/main.js
@@ -32,11 +32,23 @@ if (process.env.THESEUS_USER_DATA) {
   catch (e) { console.warn("profile relocation failed:", e?.message); }
 }
 function relocateProfile(appData) {
-  const oldDir = path.join(appData, "Theseus Navigator");
   const newDir = path.join(appData, "Theseus");
-  if (!fs.existsSync(newDir) && fs.existsSync(oldDir)) {
-    try { fs.renameSync(oldDir, newDir); }
-    catch { fs.cpSync(oldDir, newDir, { recursive: true }); }
+  // Two possible previous locations: "Theseus Navigator" (what the code
+  // originally checked for, based on the assumed productName), and
+  // "theseus-navigator" (what Electron ACTUALLY used because package.json
+  // has no top-level productName, so app.getName() falls back to the "name"
+  // field). Whichever exists is the profile the user has been running
+  // against; migrate it in place so 0.3.51 does not silently create a fresh
+  // Theseus\ next to a still-populated old dir the user cannot see.
+  if (fs.existsSync(newDir)) return newDir;
+  for (const candidate of ["Theseus Navigator", "theseus-navigator"]) {
+    const oldDir = path.join(appData, candidate);
+    if (!fs.existsSync(oldDir)) continue;
+    try { fs.renameSync(oldDir, newDir); return newDir; }
+    catch {
+      try { fs.cpSync(oldDir, newDir, { recursive: true }); return newDir; }
+      catch (e) { console.warn(`[profile] relocate ${candidate} failed:`, e?.message); }
+    }
   }
   return newDir;
 }
diff --git a/package-lock.json b/package-lock.json
index 19383f7..f46e67b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "theseus-navigator",
-  "version": "0.3.50",
+  "version": "0.3.51",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "theseus-navigator",
-      "version": "0.3.50",
+      "version": "0.3.51",
       "dependencies": {
         "@bch-wc2/interfaces": "^0.0.16",
         "@bitauth/libauth": "^3.1.0-next.8",
diff --git a/package.json b/package.json
index 39ca269..23b7d44 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "theseus-navigator",
-  "version": "0.3.50",
+  "version": "0.3.51",
   "description": "Theseus Navigator — a browser that follows the thread. By Silent Mode, a Deviant project.",
   "author": "Silent Mode",
   "main": "main.js",