Download the Cemu 1.8.1b package and extract it to a dedicated folder (e.g., on your Desktop). Game File Integration: File > Load menu to select your game file, which typically ends in Key Configuration: files, you must add the necessary encryption keys to the file located in the Cemu root directory. III. Critical Optimizations for Version 1.8.1b
First, ensure you are getting the legitimate 1.8.1b archive. (Note: The official Cemu site no longer hosts this old version by default; you may need to dig into their "Changelog" archive or Github releases).
Fix: You skipped Cemuhook. Download it manually. Cemu 1.8.1b will crash instantly without this DLL.