Working with more than one Project Interpreter

I am new to pycharm and now want to setup my development environment. On my system there are two different project interpreter but it seems, that one of them is like disabled. The Screenshot shows what I mean: the second one is grayed out, also the button "Show paths for selected interpreter" which I need to use.


When choosing the first interpreter, the button is enabled. Does anybody know how to enable the second interpreter?


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