Can’t get macOS Catalina installed

I have a 2010 Mac PrO

After I install the Catalina patch it takes me to download the OS but it doesn't let me download it. Is there something else I can do?

I have High Sierra installed and I believe my video card supports it (I bought one with metal support)).

SO, I don't know if I should go first to Mojave and then go to Catalina or...? Thanks for the help/