Steam makes it relatively easy to locate and replace save files, though you must temporarily bypass Steam Cloud synchronization.
Delete some unnecessary tunes, liveries, or vinyls to reduce file size, then try saving again.
Technical considerations on PC
Load the save. If done correctly, you will see all achievements pop (this can be risky if you later go online) and a completed world map. forza horizon 5 pc 100 save game
Inside, you will see folders with long alphanumeric names. Locate your current save file by checking the "Date Modified" timestamp. the original container files.
Download your chosen 100% save file and extract the contents using WinRAR or 7-Zip.
The Microsoft Store version uses encrypted folder names within the universal Windows package directory. Steam makes it relatively easy to locate and
Save files are between the Steam and Microsoft Store/Game Pass versions. Downloading the wrong one will simply be rejected by the game. Steam saves use a different encryption key.
The location of your save data depends on which version of the game you own:
Access rare, hard-to-find, and hyper-expensive cars instantly. If done correctly, you will see all achievements
Start your game with billions of Credits (CR) and Wheelspins.
If you use a 100% save on a fresh account, the game will unlock dozens of achievements instantly when you load it. This is a huge red flag to Microsoft. They have been known to or even suspend accounts for achievement tampering.