To start showing screenshots click the cat. Wait for detection. Clicking the screenshot will bring you to the next screenshot.
Credit to https://scratch.mit.edu/users/Scratch137/ for helping me figure out the code for the 2.0 part. Detects 1.0 and up, and earlier versions of Scratch 2.0. The original project can be downloaded here: (removed for now in case) Forum topic: https://scratch.mit.edu/discuss/topic/657600/ Will detect turbowarp and forkphorus when the saving issues are fixed. You can use this to download versions of 2.0 before v461: https://github.com/medlans/2.0-Archives Similar project by someone else, detects which 1.x version you're using: https://scratch.mit.edu/discuss/post/7638826/
