Here you can repack your Ren'Py game to fix the save file and make it running in the new Ren'Py version.
Beginning with Ren'Py 8.0.x or 8.1, a security check was added to the code which is an attempt to defeat bad actors from interjecting malicious code onto someone's computer via Ren'Py save files. If one attempts to load a save file that has not been generated with the token found on the player's machine, a warning as shown above will appear. If you're confident the save file is clean, you have the choice to allow it to be used.
However, if you manipulate one of your own save files and attempt to use it, regardless of choosing 'YES', the file will not work/load. There are ways to get around this problem as the following describes
Location of Ren'Py security keys file: https://savelocation.net/renpy
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Prices per month, plus VAT. Maximum file size is 20 MB on every paid plan and 10 MB on the free tier.
Your file downloaded fine. But this save was written by Ren'Py 8.1 or newer, which signs every save with a key that lives on your computer — and editing it breaks that signature. Load it as-is and the game will refuse it without saying why: you click the slot and nothing happens.
Signing it is free and takes about a minute — the Repack page asks for the file you just downloaded and your security_keys.txt, and hands back a save the game accepts.
security_keys.txt
Editing Ren'Py saves often? Any paid tier stores the key once and signs every download for you, so this step disappears.
Where do I find security_keys.txt? · Signing works without an account.