Can not get legacy LR6 to install

I am a long time of LR6, standalone edition. When I changed my PC recently, I tried to reinstall it. It puts me into a reiterative loop, saying I have to log into Adobe to proceed. When I do, and try to install, it brings me back again to the same message, saying I have to log into Adobe to proceed. Adobe Tech Support have told me they cannot assist as the product has reached end of life. Can anybody assist? Thanks.