Sorry you’re having some trouble! However, these are the community forums, populated with other users like yourself. If you’d like to communicate with the developers, the Pixologic Support site is the tool to do that with. This sort of post is wasted on people who don’t actually develop the program. If you contact support and make your case for why you need a legacy installer, perhaps they can assist you.
While the Clay Polish function seems to be working as expected for me, I’ll assume that since you have a Support Ticket in that you have documented a more specific issue with its use. If your issue has been investigated and actually found to be a bug, there could be any number of reasons why a fix hasn’t been issued yet. It may not have yet been solved, it may not have been solved in time to make it into the last patch, and it may simply not be a high enough priority compared to other issues. This would frankly be a much lower priority issue than the significant performance problems that needed to be addressed in the first patch, and that affected a much wider variety of users.
Not everyone has the same workflow, and different issues may impact users to different degrees. I wasn’t even aware of this problem. I’m sorry this particular problem is a drag for you.
But just to be clear, Pixologic Support is the place to go for
Bugs and repeatable technical issues.
Feedback or feature requests aimed at the developers.
The forums here are home to volunteer users that answer questions on the use of Zbrush to other users. They cannot help you with your problem, and communication aimed at the developers is likely to be missed by the people who actually develop the program.