I bought Vegas Pro 18 as part of a humble bundle offer - been using v16 for years.
Edited my first video, but when I cam to click 'render' it threw an error at me - cannot quite remember the error but was something about the serial key being registered to another address - then it kicked me out. On reopening I get the welcome splash where it wants the serial and email. I cannot get past this - keeps saying the serial is registered to another address.

Any ideas?