Please check my question!
When I try to install the launcher for the first time, it says that this package isn't supported. Please contact your .... How can I fix this?
Are you using a 64-bit operating system? It is required in order to install and run the Launcher/Editor.
If you are using a 64-bit OS, post your Dxdiag (system specs) here.
Windows: Go to the Start menu and type ‘dxdiag’ into the search bar. Open the file and then click ‘Save All Information’. Post that text file here.
Mac: Go to the Apple menu and click ‘About This Mac’.
We haven’t heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you’re still experiencing this issue, please try the suggestion that I mentioned above. Then post back here with the requested info.