After changing the executable name EET installs without errors. Unfortunately the program dies:
Exception Type: EXC_BAD_ACCESS (Code Signature Invalid)
Exception Codes: 0x0000000000000032, 0x0000000100c0ddb0
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: Namespace CODESIGNING, Code 0x2
Obviously macos (BigSur) doesn't allow the execution of modified binaries. I don't know if there is a way around this check.