Microsoft announced that multiple versions signed using the insecure Secure Hash Algorithm 1 (SHA-1) will reach end of support on April 26, 2022. Microsoft is retiring these versions because they are digitally signed with certificates that use the legacy SHA-1 cryptographic hashing algorithm, which is now insecure. Developers are recommended to migrate their applications to at least.NET Framework 4.6.2 or later before April.2 to stay supported. Microsoft also retired all Windows-signed. SHA-2-signed content from the Microsoft Download Center in August 2020, after changing the signing of Windows updates to use the.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-announces-end-of-life-for-multiple-net-framework-versions/