When upgrading from SCOM 2012 SP1 to 2012R2, you will need to install the following prerequisites:

1. MICROSOFT® REPORT VIEWER 2012 RUNTIME
2. Microsoft System CLR Types for SQL Server 2012
   • 64-bit
   • 32-bit

Of course you can also download them straight from Microsoft. The links are provided below.

• https://www.microsoft.com/en-us/download/details.aspx?id=35747
• https://www.microsoft.com/en-us/download/details.aspx?id=29065