fix up branch that 1-click installers will pull from

installer/install.bat

@@ -72,8 +72,7 @@ if not exist ".git" (
     call git init
     call git remote add origin %REPO_URL%
     call git fetch
-#    call git checkout origin/main -ft
-    call git checkout origin/release-candidate-2-1 -ft
+    call git checkout origin/main -ft
 )
 
 @rem activate the base env

installer/install.sh

@@ -87,7 +87,7 @@ if [ ! -e ".git" ]; then
     git init
     git remote add origin "$REPO_URL"
     git fetch
-    git checkout origin/release-candidate-2-1 -ft
+    git checkout origin/main -ft
 fi
 
 # create the environment