or configuration files found in the root folder before moving the app to a new PC. If the app fails to launch, try running it as Administrator

A: That's the key. There is no major, reputable software called "The Spellbook" that matches this filename. Its absence from the internet strongly suggests it is not an official, widely-distributed program.

The "portable" nature implies no registry entries, no DLL dependencies beyond Windows 10/11 x64 system libraries, and all configuration stored within the extracted folder.