The macOS Catalina installer exceeds 8GB, making a 16GB or larger USB 3.0 drive mandatory.

UniBeast is a free Mac application created by the team at tonymacx86. Its primary function is to take a legitimate copy of a macOS installer (downloaded from the Mac App Store) and write it onto a USB flash drive, making it bootable on a standard PC.

Enter your system password and click Create . The process typically takes 10 to 40 minutes depending on your USB drive speed. Troubleshooting Common Errors "UniBeast could not create the USB drive"

Are you trying to install specifically, or are you looking to set up a more recent version of macOS?