Has anyone experienced this...

i've been trying to upgrade my Thinkpad X220(running win7) to Windows 10 for weeks now. i've tried many times to upgrade it, but every time i click "Upgrade Now", it seems to hang. i've tried terminating and restarting it many times, same result.

i've tried disabled the firewall and AV, and freeing up disk space; same result.

Any suggestions? tia