diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b37488..59833eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,11 +2,12 @@
 
 ## v1.3.4 — Taint Analysis & Error Fixes
 
-*Resolves the `l10n` initialization error in `GameVersionError.lua` and confirms the integrity of the WotLKDB module after a deep taint analysis.*
+*Resolves the initialization error in `GameVersionError.lua` and implements a version guard to support Classic-era private servers. Also confirms the integrity of the WotLKDB module after a deep taint analysis.*
 
 ### Core & Stability
 
-- **[Fix]** Resolved `attempt to call local 'l10n' (a table value)` in `GameVersionError.lua` by using hardcoded English strings for early-load error messages.
+- **[Fix]** Resolved `attempt to call local 'l10n' (a table value)` in `GameVersionError.lua` and implemented a `tocVersion` guard to prevent the "unsupported client" error on Classic-era private servers (e.g., Turtle WoW).
+- **[Fix]** Updated `GameVersionError.lua` strings to correctly identify Questie-X as supporting Classic and private servers.
 - **[Taint Analysis]** Completed a full audit of `Questie-X-WotLKDB`. No direct taint vectors or secure function overrides were found.
 - **[Version Sync]** Synchronized versions to v1.3.4 across all components.
 
diff --git a/Modules/GameVersionError.lua b/Modules/GameVersionError.lua
index 810e58f..9dd5e17 100644
--- a/Modules/GameVersionError.lua
+++ b/Modules/GameVersionError.lua
@@ -1,22 +1,28 @@
 ---@type l10n
 local l10n = QuestieLoader:ImportModule("l10n")
 
+local _, _, _, tocVersion = GetBuildInfo()
+if tocVersion and tocVersion < 50000 then
+    -- This is a Classic-era client (Turtle, Era, WotLK, etc.)
+    return
+end
+
 -- No timeres or other fancy stuff as 1.12 client is very limited.
 
 -- StaticPopup has very limited width, so text is split to many lines.
 local msg = {
-    "You're trying to use Questie addon",
+    "You're trying to use Questie-X",
     "on an unsupported WoW game client!",
 
-    "WoW \"retail\" and private servers",
-    "are not supported.",
+    "WoW \"retail\" is NOT supported.",
+    "Please use a Classic-era client.",
 
-    "Questie only supports",
-    "WoW Classic (Era/Wrath)!",
+    "Questie-X only supports",
+    "WoW Classic (Vanilla/TBC/Wrath)!",
 }
 
 StaticPopupDialogs["QUESTIE_VERSION_ERROR"] = {
-    text = "|cffff0000ERROR|r\n" .. msg[1] .. "\n" .. msg[2] .. "\n\n" .. msg[3] .. "\n" .. msg[4] .. "\n\n" .. msg[5] .. "\n" .. msg[6],
+    text = "|cffff0000ERROR|r\n" .. msg[1] .. "\n" .. msg[2] .. "\n\n" .. msg[3] .. "\n" .. msg[4] .. "\n\n" .. msg[5] .. " " .. msg[6],
     button2 = "OK",
     hasEditBox = false,
     whileDead = true
diff --git a/docs/changelog.html b/docs/changelog.html
index e7c22bd..d907e24 100644
--- a/docs/changelog.html
+++ b/docs/changelog.html
@@ -177,11 +177,12 @@
 
     <div class="container">
         <h2 id="v134">v1.3.4 — Taint Analysis &amp; Error Fixes</h2>
-        <p><em>Resolves the <code>l10n</code> initialization error in <code>GameVersionError.lua</code> and confirms the integrity of the WotLKDB module after a deep taint analysis.</em></p>
+        <p><em>Resolves the initialization error in <code>GameVersionError.lua</code> and implements a version guard to support Classic-era private servers. Also confirms the integrity of the WotLKDB module after a deep taint analysis.</em></p>
 
         <h3>Core &amp; Stability</h3>
         <ul>
-            <li><strong>[Fix]</strong> Resolved <code>attempt to call local 'l10n' (a table value)</code> in <code>GameVersionError.lua</code> by using hardcoded English strings for early-load error messages.</li>
+            <li><strong>[Fix]</strong> Resolved <code>attempt to call local 'l10n' (a table value)</code> in <code>GameVersionError.lua</code> and implemented a <code>tocVersion</code> guard to prevent the "unsupported client" error on Classic-era private servers (e.g., Turtle WoW).</li>
+            <li><strong>[Fix]</strong> Updated <code>GameVersionError.lua</code> strings to correctly identify Questie-X as supporting Classic and private servers.</li>
             <li><strong>[Taint Analysis]</strong> Completed a full audit of <code>Questie-X-WotLKDB</code>. No direct taint vectors or secure function overrides were found.</li>
             <li><strong>[Version Sync]</strong> Synchronized versions to v1.3.4 across all components.</li>
         </ul>