- why are you using the version number? You can simply use your application id which will, by default point to active version
- What type of ago are you hosting in app engine? Are you just trying to have your discourse to have a link to your app engine app? If so, check my forum at community.AppyBuilder.com. make sure you are viewing in desktop mode. If in desktop mode, you’ll see a puzzle block Icon at top right. Clicking on it will open our app engine app. Check and see if that’s what you are looking for