Follow these steps in order to install and activate KOMPLETE Elements MK2 content on macOS 10.15 Catalina:
1. Download both Elements Selections:
2. Unpack the zipped files and move all the library folders to the desired location on your hard drive.
3. Download the plist-files for both Selections:
4. Move both plist-files to the following folder: Macintosh HD > Library > Preferences
5. Open Native Access and click the Installed products tab. Both, Kontakt Elements Selection R2 and Reaktor Elements Selection will appear in the list with a yellow REPAIR button:
6. Click the REPAIR button for the Kontakt Elements Selection and choose RELOCATE. Navigate to the location of your 'Kontakt Elements Selection' that you chose in step 2.
7. Repeat step 6. for the Reaktor Elements Selection.
Both Elements Selections are now installed and activated on your system.