Hi everyone, I have a problem with uploading maps to my TomTom Start 20. I'm following the instructions step by step in ttactivator 1.20, however at the end of the process, when the map installation progress reaches 100%, an error appears:

2-3065980-35-0-2655-64-0-1-0 Install failed:102 - Failed to verify signature

I have seen on other forums that someone else had the same error, but there was no solution posted.
App wersion is 12.075.3065980.84 Does anyone know what might be causing this problem?
Thank you in advance for your reply.