It took less than 2 days to:
1. Download to a stick & install Linux on what was a Windows boot drive.
1.a. Configure the above.
2. Download and build UE 5.4.1.
3. Build all Marketplace plugins for Linux, correcting their bugs.
4. Copy the 5.3.2 game and build it for 5.4.1, correcting my bugs.
5. Start the editor with the game as its target.
6. Build Derived Data cache, correcting errors.
7. Run the game and do some grinding.
Whee! 😎 🤘