Strange problem here - I’m slimming down a site for a rebuild and have removed a bunch of plugins including ultimatemember and woocommerce.
After I removed these, I then updated Pro theme to 2.0.4 and started the build.
I’ve since noticed that I can’t install the template starter pack or access the design cloud.
It worked on this site after the upgrade - once - then I can’t access it again.
Have increased PHP memory for this site as recommended in other posts and increased php execution time to 300.
The error suggests that the file I’m uploading is not properly formatted.
I’ve also ftp replaced the whole pro theme folder and the child theme folder.