MS .NET Framework - do I need all these versions? and to update them?

[joro]

I ran a scan in Secunia PSI (recommended in a Windows Secrets article) and it told me I need to update four versions of Microsoft's .NET Framework.

ms net update.jpg

Do I need all of these?
Why won't the latest version (4) do it all?
And do I really need to update this?

[Medico]

A Google Search shows many sites with details of .net. Some of these articles get into very detailed discussions of .net. It appears each does build on the previous versions, but that each version is necessary for various apps you might use. This seems to be a very simplistic statement, but it does appear you should leave all installed and updated. Others may have more detailed explanations, but I have not had any problems with all versions being installed and updated.

[ruirib]

It's most likely that you will need those versions, indeed, as Ted explained, because your installed apps are likely to need them. It's really no big effort do keep them, as Windows Update will make sure any patches are added as needed.

[mrzag]

A Google Search shows many sites with details of .net. Some of these articles get into very detailed discussions of .net. It appears each does build on the previous versions, but that each version is necessary for various apps you might use. This seems to be a very simplistic statement, but it does appear you should leave all installed and updated. Others may have more detailed explanations, but I have not had any problems with all versions being installed and updated.

Finally, I find a answer to 1 of my questions that it's ez to understad.

tyvm

[Medico]

You are very welcome.

[joro]

Ditto mrzag's thank you note.

A tip of the hat to tedshemysers and ruirib for their quick and clear responses. They make this forum a jewel.