ShortPoint Add-In for SharePoint Online and Office 365 will not work without turning on scripting capabilities.

It takes about 24 hours for this change to take effect


Step 1: 

Login to your Office 365 admin center page with administrator account, then choose Admin


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Step 2: 

Go to SharePoint Admin Center


 


Or in the new admin center




Step 3: 

Open Settings



Step 4: 

Allow users to run custom script on personal sites and self-service created sites



Step 5: 

Click Ok


It takes about 24 hours for the change to take effect


Detailed Steps from Microsoft: Turn scripting capabilities on or off


NEXT: Setup App Catalog