I bought Ref.17 to upgrade my v16, but when I try to install over the top I get an error message saying can't install, disk may be full (when it's not)
So i uninstalled v16, rebooted and tried again - same error.
So i tried installing v16 back again - same error :(
I'm guessing there's something on my system upsetting the installation, just wondering if you could help me out with pointers to possible causes?

Many thanks