Yes, I have this file. I can extract it and create the project manually. There is no problem with that, I was using Eclipse for STM32 projects for a few years. Now I wanted to give System Workbench a try and see if the project creator can save me some work and be an alternative to standalone Eclipse. But it seems it can’t, I have to do everything as before.
Indeed there was toolchain extraction problem. I think it was because the Workbench wasn’t run as administrator. When I started Workbench as administrator the extraction succeded.
There are 26 GB of free space on disk.