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What files? You may be thinking of an earlier thread with the release, which is still there. If you want the latest release, go to the Marlin GitHub and download the most recent bugfix and the associated configuration files for the Anycubic Predator (under the "delta" examples).

Compile using Platformio under VSCode, and install the firmware.bin using the instructions in the readme.md file, using the STMicro Demonstrator GUI. Make sure you create a back-up of your existing firmware before you start!