Native Instruments allows between users. This means you can buy a used license from someone who owns Guitar Rig 5.
Instead, I’d be glad to help you draft a post that is — for example: Guitar Rig 5 Serial Number
Since Guitar Rig 5 is a legacy product, users often encounter errors with the modern Native Access Native Instruments allows between users
To find or manage your serial number, you should use the official Native Access management tool provided by Native Instruments . Where to Find Your Serial Number Guitar Rig 5 Serial Number