I typed this up before I say you said your were a partner so I'm including the information anyway.

View Document - Sage Knowledgebase - Unable to access Payroll module (for Business Partners and SAN Customers with NFR keys and Customers with Read Only Access

Here are the instructions for standard users

View Document - Sage Knowledgebase

1. Have all other users must exit Sage 100 before proceeding
2. Open Library Master, Setup menu, System Configuration
3. Click the Registration tab and note the product registration keys
4. Click Edit, enter the new product registration keys (if updating or changing them)
5. Click Activate
6. Click OK when the following message appears: "Activation was successful."
7. Exit Sage 100, then open and log back into again.

You can also try the update button on the same page.

Sometimes i get an error it can't be saved when I close the system configuration and it won't let me save but it still does it.