I just found that I couldn't open Xampp after upgrading to Big Sur. My question is: How do I access htdocs folder? I'm afraid that it will override the htdocs folder if I install the latest version of Xampp.
did you check the hide folder named ".bitname" in your profile root folder? If not, try to find the "xampp" folder inside ".bitname/machines" and copy it to another folder to backup current xampp data.
After isntall/reinstall xampp just put the folder back to the same place ".bitname/machines".
Steps:
PS: If you have another MAC maybe is a good idea to test it before using a simulated xampp instalation!