Some users of the older version of Quick Sale (discontinued) are reporting an issue showing the following message:
"Quick Sale" Needs to Be Updated
The developer of this app needs to update it to work with this version of iOS.
Important: Please don't remove the app or you will lose your Quick Sale data.
To resolve the issue, please follow these steps:
Recommended: Backup your iPad to iCloud before making any changes. For instructions please visit the following Apple support page: https://support.apple.com/en-us/HT211228
Open Settings and navigate to General > iPad Storage.
Select Quick Sale from the apps list.
Confirm the version selected is 2.7.14
Tap Offload App.
After the offload is done, tap Reinstall App.