No. Mipony licenses are hardware-locked. Your friend’s key will not work on your computer.
Cybercriminals know that people searching for free activation codes are willing to disable their antivirus or run suspicious files. Keygens and cracks are common delivery mechanisms for:
Yes, but only if you did not previously activate Pro. Trial status is stored in the registry. Reinstalling Windows will reset the 30-day trial, but that is a lot of work for a few weeks of Pro features.

