: Plug the drive into your old PC and restart. You must enter the BIOS (usually by tapping F2, F12, or Del) and: Disable Secure Boot . Set the USB Drive as the primary boot priority.
: If your PC has an exceptionally old Nvidia GPU, you may need Batocera 5.26 , which was the final 32-bit version to include legacy Nvidia drivers. batocera 32gb pc 32 bits link
Batocera for 32-Bit PCs: The Ultimate 32GB Retro Gaming Setup : Plug the drive into your old PC and restart
While it is always safer to build your own, some users look for "ready-to-go" images on community sites. you may need Batocera 5.26
While Batocera can run on drives as small as 16GB, a is the recommended baseline for full functionality.