I installed the alternate version. Before I tried also the 64 bit version but I did get a warning that it is not matching. My windows is in 32 bit.
I did not see or understand which file I have to rename from the link.
Just for the case someone else has the same problem as me.
I deactivated and deleted all malware and also windows firewall and windows defender. I installed anki again, nothing worked. There I found a report of a malware program as I searched for this QtWeb...exe file. I deleted it also.
So after I installed and deactivated all this software and deleted this report, I deinstalled anki and downloaded it again and installed. Now it is working. I can not specify which step was the key issue but now its working.
Thank you very much, I am appreciating your service and help.