I'm afraid I can't offer personally tested suggestions for antivirus alternatives. Some years ago I used Norton on my Mac, and it played fine with my Creative Suite, but I can't speak to how the modern version interacts with CC. This article provides some reviews if you decide to replace Avast: 10 best antivirus for Mac 2017 | Do Macs need antivirus? Best free Mac antivirus – Techtop100.
All that said, I might suggest that, before going to a different program, you try setting up an exclusion for Creative Cloud (and other affected programs) within Avast to see if that resolves the issue. Directions are here: Avast FAQ | Avast Mac Security 2015: Setting Exclusions.
You might also want to take a look at this post on the Avast forum. It's a couple years old, but it might be relevant to your situation: Avast and Adobe CC 2014 e.g. Photoshop etc.
Let us know how it goes!