Issue
When trying to update the Nintex for Office 365 apps from within SharePoint Online, the 'Get It' button is missing from the SharePoint Online Store page after selecting 'An update for this app is available.'
Resolution
The steps below are to resolve the issue for Nintex Workflow for Office 365, if the issue is also occurring with Nintex Forms for Office 365, please repeat them for that app as well:
- Open SharePoint Admin Center
- Select Apps > Manage Licenses > Nintex Workflow for Office 365
- Under 'License Managers' select 'add manager' and add an active Admin account
- Return to the Site Contents and attempt to re-update the Nintex for Office 365 app
Additional Information
If there are expired/deactivated user accounts under License Managers it is recommended to remove these accounts from the list of license managers.