Keep both your license key and e-mail used for activating Gig Performer in a password manager or a textual file on your desktop to avoid last minute emergencies.
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Background:
Some people:
use different e-mail addresses for different purposes
or their band manager bought them a license
or license is bought through a company with a business e-mail
or their wife bought them a license (!!!)
… so we (not frequently) receive tickets stating “the license doesn’t work”, “their license expired”, etc. and they did a computer update just before a show so “urgent”, “urgent”.
They know their e-mail address, but can’t remember the license key, or they know the license key but the e-mail is wrong.
I am trying to get in the habit of deactivating GP whenever Windows forces an update
Yes, having the serial number (and email, if helpful) on a notepad on your desktop is great advice. It had been very helpful several times now and I expect it will be helpful going forward.
I actually keep every sw license and some notes about them in a notes file that is synced across my computers and backed up. It has helped me avoid hassle on several occasions.