Docker for windows doesn't work. What could I do with it?
I finally solved that. I deleted manually all the directories related to docker (ProgramFiles, ProgramData, [user root directory], Appdata/Roaming etc.) and this way the installer finally finished. There was another problem, that WSL2 engine tried to start, but couldn't. WSL was enabled, the engine starting process was running for ca. 1 hour... but nothing happend and couldn't even change the engine. So I reinstalled once again, and didn't install the WSL frame. It started automatically with Hyper-V and now it works fine.