Can't install Freelance Plus 2014

I'm trying to install my second Studio 2014 Freelance plus licence on a new laptop running Windows 11.  When it gets to the 'SDL Trados Studio 2014 SP2 Setup' box, it indicates it's downloading 1 out of 59 files and then I get the following error message; 'An error occurred while downloading a required file.  You may retry downloading the file or cancel setup.'

At a loss as to what to do, I went back to my SDL account and tried to deactivate the license - but there's only an activation button on the license page, so I can't deactivate it...  I did manage to generate an offline deactivation certificate, but I can't 'return it to SDL' as there's no deactivation button.... I'm at a loss and have wasted hours trying to figure this out...

Please help!