1. *** IMPORTANT! ***: Close InnoExtractor before execute this keygen.
2. Generate a key and copy it.
3. *** IMPORTANT! ***: Close this keygen.
4. Open InnoExtractor and click "Donate to Upgrade to Plus!"
5. Hit Ctrl + Shift + Y and paste the generated key in the "Donation Key" box.
6. Done.
 
Works.