Yeah, from what I’ve read. Itch.io changed some things in the delivery system for games through the launcher.
So you may need to uninstall the game and install it again.
On computer there shouldn’t be any problems if you uninstall the game, because it will keep a copy of the saves in a separate location.
But if you want to be extra safe you can go to the folder where the game’s installed, follow the path
"CorruptedKingdoms-0.X.X-pc\game\saves"
and make a backup of the contents of the saves folder.
If you’re using the launcher, you can get to said folder easier by clicking the gear icon, then “Manage”, followed by “Open Folder in Explorer”