Is Guitar Rig 7 PRO COMPATIBLE WITH CATALINA OS?
Unfortunately, it's not. As per its System requirements, Guitar Rig 7 needs "macOS 11, 12 or 13 (latest update)" to run. Basically Big Sur and up. Catalina was macOS 10.15.
You can contact NI through here: https://support.native-instruments.com/hc/en-us
Very GOOD OFFER, if Compatible With Macos Catalina 10.15.7
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Compatibility of Native Instruments Products on macOS