App Catalog Permissions
Use the below steps to add yourself as a Site Collection Administrator for the App Catalog. You will not be able to install or upgrade Sprocket if you are not a Site Collection Administrator
caution
You have to be a Global or SharePoint administrator in your Office 365 tenant to do this. If this is not the case, please forward these instructions to your SharePoint administrator.
Step 1:
In the SharePoint Admin Center click on Sites -> Active Sites. Select the app catalog site and click on "Permissions", then select "Manage Admins".
Step 2:
Add yourself to the administrators.
Click Save