Regarding activation, my experience was that after clicking the activation tab it took a few second for the pop up dialog box to appear. I entered the key and after a few second it stated that it succeeded. I then restarted VSDC Video Editor as directed but it still showed the version as Fee Edition, not the Pro Edition. I closed the program and rebooted my computer then opened the program again and it shows that it is the “Pro Edition V5.7.8.724” and “Licensed to: SharewareOnSale.
I’ve had the same experience in the past. If a giveaway program appears to fail to activate just reboot the computer.
Good luck.