Bought QuikGIF Pro on the Mac App Store? Everyone in your Apple Family Sharing group gets Pro - at no extra cost.
QuikGIF Pro is a one-time, non-consumable purchase, and it is enabled for Apple Family Sharing. When you buy Pro through the Mac App Store, up to five family members in your Family Sharing group can unlock all Pro features on their own Macs without paying again.
If your family group already has Purchase Sharing turned on, there is nothing extra to do - the purchase is shared automatically. To use it on another family member's Mac:
Upgrade to Pro… → Restore Purchases.If you haven't set up a family group yet, the organizer can create one in System Settings → Family (or Settings → Family on iPhone/iPad) and turn on Purchase Sharing. Apple's guide walks through it: Set up Family Sharing.