Today, I bought the ArcGis Pro for single user. Download was successful. But I got stopped by the issue of having a public account. If followed the links provided in these forums:
https://community.esri.com/t5/my-esri-blog/tips-tricks-arcgis-pro-and-public-accounts/ba-p/888451
However, the problem persists. When I sign in as, I presume, the administrator the only one license is already taken for somethig I did previously. There is no possibility to obtain a licence file:

At a certain moment, I created a new user for my "organization" (it was just me with the same email) but did not work either.
I appreciatte your help in solving this issue.