When a user first launches Excel, PowerPoint, or Word after UpSlide installation, a prompt box may appear with the message below. To avoid this, you have to install the UpSlide certificate in the Trusted Publisher store.
This is the way Microsoft Office handles trust. Phrases you may see include:
- Are you sure you want to install this customization?
- The solution cannot be installed because it is signed by a publisher whom you have not yet chosen to trust. If you trust the publisher, add the certificate to the Trusted Publisher list.
- Publisher cannot be verified.
To prevent this, install the certificate
- Download the certificate here: Public certificate
- Right click the file, select Install Certificate, and choose to install the file in the Trusted Publisher store.