Simplify, don't use a constant for AppVersion because of the version info side effect.

isportable.iss

@@ -7,7 +7,7 @@ begin
   Result := ExpandConstant('{param:portable|0}') = '1';
 end;
 
-function GetAppIdOrVersion(Param: String): String;
+function GetAppId(Param: String): String;
 begin
   Result := Param;
   if PortableCheck then

setup.iss

@@ -12,8 +12,8 @@
 
 [Setup]
 AppName=Inno Setup
-AppId={code:GetAppIdOrVersion|Inno Setup 6}
-AppVersion={code:GetAppIdOrVersion|6.1.0-beta}
+AppId={code:GetAppId|Inno Setup 6}
+AppVersion=6.1.0-beta
 AppPublisher=jrsoftware.org
 AppPublisherURL=https://www.innosetup.com/
 AppSupportURL=https://www.innosetup.com/