You can obtain .iso image containing Infor SyteLine 8.03 Service Pack 20 from www.inforxtreme.com. If you mount the .iso image or extract it you’ll find the SP20_Infor_SL803_ERP executable file.
Run the file to extract the installer package. Once completed you’ll need to run the Infor ERP SL Configuration Wizard which can be found in the Start menu under Infor > Setup.
It’ll take a while for the Configuration Wizard to initialize. Next, click on a checkbox next to Apply Service Pack 8.03.20 to Databases, and press the Next button.
You’ll want to apply the patch (Service Pack 20) against the Apps databases only – not the Forms databases. SP20 should be applied on your FormSync database and they FormSync’ed to the appropriate Forms databases afterwards.