diff --git a/.github/workflows/unreal_ci.yml b/.github/workflows/unreal_ci.yml
index 84ad97b3c2..fd9c69669e 100644
--- a/.github/workflows/unreal_ci.yml
+++ b/.github/workflows/unreal_ci.yml
@@ -89,9 +89,10 @@ jobs:
     - name: Prepare
       shell: bash
       run: |
-        wget -O v8lib.tgz -q  ${{env.V8}} 
-        tar xvfz v8lib.tgz -C unreal/Puerts/ThirdParty
+        wget -O jslib.tgz -q  ${{env.V8}} 
+        tar xvfz jslib.tgz -C unreal/Puerts/ThirdParty
         wget -O temp.tgz -q  ${{env.Engine}} 
+        ${{ matrix.cmdinfo['change_backend'] }}
         tar xvfz temp.tgz
         mkdir output
         sudo xcode-select -s /Applications/Xcode_12.5.1.app