When to prefer a newer version
Microsoft officially ended mainstream support for .NET Framework 4.5 on January 12, 2016. microsoft .net framework 4.5 developer pack download
. Security fixes and technical support are no longer provided for these versions as of April 2022. Visual Studio 2022+ Limitations When to prefer a newer version Microsoft officially
Unlike the standard runtime (which only lets you run apps), the Developer Pack includes: microsoft .net framework 4.5 developer pack download
Reference assemblies needed to build apps that target the specific framework version in Visual Studio.