Samplitude is Windows only so your only option is to install BootCamp on your new Mac and then reinstall your version of Samplitude. Hopefully it will run without problem but be aware that if you are running Mac OSX Catalina, any installed app must be 64 bit. I suspect Samplitude Pro X2 may well be 32 bit only.
I was under the impression that Boot Camp boots the machine directly into Windows, so the version of macOS installed is irrelevant to the Windows instance. If you can install a version of Windows that will run X2, it should be fine.