If on windows - just download new update and play, save file is outside game folder
If on Android - download and install on top of exisitng, DO NOT UNINSTALL OLD as this WILL DELETE SAVE DATA
Cheers
Why would I be annoyed? You're asking a genuine question.
As for your question (I assume you play on Windows PC) let's say you downloaded the game and extracted it to "C:\Users\<username>\Desktop\REC" so there you have a All game files, except the save data which in turn is stored in "C:\Users\<username>\AppData\Roaming\Godot\app_userdata\REC"
So even if you were to delete the game files at "C:\Users\<username>\Desktop\REC" your save file is safe and accessible for newer versions.
Hope this helps,
Cheers