Reference: Sitefinity CMS and .NET framework compatibility
The following article lists the compatibility of Sitefinity CMS releases with Microsoft .NET framework versions.
|Sitefinity CMS release
|12.0 to 13.1
|11.0 to 11.2
|10.0 to 10.2
|4.0 to 10.0
IMPORTANT: Before upgrading your Sitefinity CMS, you must install the Microsoft .NET framework version that is compatible with the new Sitefinity CMS release.