The 2018 Year End Updates includes changes for 1099 and W-2 reporting to comply with 2018 tax year regulations. Included with the update files is a technical document. TY2018YrEndUpd.pdf "Microsoft Dynamics SL 1099 and W-2 Reporting for Tax Year 2018" details the changes being made with this update along with detailed installation instructions.
These updates support the Microsoft Dynamics SL versions in the listing that follows. You do not need to install the 2017 year end updates before installing the 2018 updates.
Microsoft Dynamics SL 2015
Microsoft Dynamics SL 2015 CU1
Microsoft Dynamics SL 2015 CU2
Microsoft Dynamics SL 2018
Are there plans for future releases to Dynamics SL?