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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?
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The article hasn't been updated in a while, but the fundamentals are the same.
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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.
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oneAPI has according to the literature the classic Fortran compiler built in -
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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.

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