Crystal Reports is a product by SAP. The serial number is for activation. If they're using an outdated version like 2011 SP4, it's very old. They might need an upgrade or a valid license. I should suggest contacting SAP support to get proper assistance. Maybe they need to upgrade to a newer version, which might require purchasing a new license.
: If the software is still installed, you can view a partially masked version of your key under Help > License Manager . crystal reports 2011 sp4 serial number updated
If you have access to the Crystal Reports Designer interface, this is the safest method to add or update your key. SAP Community Crystal Reports 2011. Navigate to the License Manager to enter your new 19-character or 23-character product key. (Optional) Remove the old or expired key if necessary. 2. Update via Windows Registry Crystal Reports is a product by SAP
