Color Efex Pro 4 and GRFX Studio Pro AI won't work.

[eaglewatcher]

I recently purchased GRFX Studio Pro AI and Nik color Efex Pro 4.  Both are suppose to work on High Sierra operating system. Studio Pro crashes photoshop 2020 immediately and message that pops up when trying the Nik filters reads that it can't complete the command because of a problem with the filter module interface. What is a filter module interface? I am using as mac and Apple doesn't know what that is. 

[JJMack]

Don't try 2021 it does not support High Sierra

[eaglewatcher]

trying on 2020 and CS5

[eaglewatcher]

I am operating High Sierra version10.13.6 and have problems opening GRFX Studio Pro AI. It is suppose to work on High Sierra photoshop 2020 and CS5, but crashes photoshop the moment it attempts to open. Also while I can use the Nik filters, they open in CS5, but not in photoshop 2020 and give me the message that there is a problem with the filter module interface., How can I get them to work. ken lubas