When your license expires, calculations will result in a #VALUE! error. Click on a cell with the #VALUE! error, then point at the error symbol to read the actual error message.

To renew your license, on Excel Ribbon click Formulas → Calculus Functions → Account → Renew License.

1. Login to your excel-works.com account and visit the Buy page to purchase a monthly or annual license for your target computer.

2. Navigate to Apps and Features and scroll down to find ExceLab then click Modify.

   

3. On the ExceLab Setup dialog, click on Install New License.

   

   On the next dialog, enter your login Email/Password for excel-works.com to retrieve and install your new license.