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Are higher versions of the .NET Framework compatible with lower versions?

If the application requires the .NET Framework 1.1, will it work if I installed the .NET Framework 3.5 or 4?

When I try to start the application, I get an error

"Unable to find runtime version to run this application."

I read on another site that installing .Net Framework 1.1 will solve it. I downloaded and installed v4. Now the error is gone but now it shows

"requested operation failed."

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3 answers

In at least 99% of all cases: Yes.

This can only be a problem if the .NET 1.1 application uses classes or members that are marked obsolete and removed in the previous structure of the target structure, such as .NET 2.0, for example.

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Yes, CLR is backward compatible. For example, CLR 4.0 is capable of loading assemblies compiled with CLR 2.0.

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Like saying earlier, yes, but maybe you could use 2.0 instead? because he solved many security problems and provided the best features. I generally do not see where the 2.0 net application will not work (even with mono).

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Source: https://habr.com/ru/post/1333556/

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