installing python

[emaraiza98]

I installed pycharm for a computer science class, and installed python 3.5.2. 
However, my computer won't accept 3.5.2 so my teacher told me to install an 
earlier version to change the project interpreter. I did but when I tried to 
open python with pycharm it said that the "SKD is invalid". I don't know what 
I'm doing wrong and I have to have everything installed and running by 
Wednesday.
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