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Is there a known process on how to install the 2021.1 classic compiler and still maintain the ability to use the 2020 version within Visual Studio? Or is it seamless?
oneAPI installation will not remove your previously installed compilers from your system and from Visual Studio. It will only replace the integration component with the latest one in oneAPI.
Your old compiler will stay installed, but VS integration may not support compilers more than two or possibly three versions earlier. I know that the 19.1 compiler is still supported.
