Can't install pip for Python 3.7.4 in Ubuntu virtual OS

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Okay, I decided to scrap Ubuntu and install Linux Mint Cinnamon 18.0 instead. This seems to have gotten me much farther than I was before. Python 3.5 is already installed. Pip 8 was already installed, but I updated it to version 19. Before doing that, however, I installed click because the script I'm using imports click as the first step followed by re. So then I tried to run my script but got the same error I was getting on Windows 10, which is that Python couldn't find click. This didn't make sense to me because I just installed it. So, I had to search and found that it was installed in the site-packages directory for Python 2.7, which is also installed. However, I need to use Python 3.5. So, I've been trying to figure out how to install click into Python 3.5 dist-packages folder but haven't been able to. Another option would be to modify the system path for Python 3.5 to find click where it's currently located, but the articles I've read don't tell me how to do that either. Is there someone here who can explain one of these options to me? I'll repeat them below:

1. How do I install click into Python 3.5 dist-packages directory?
or
2. How do I change the system path so that Python 3.5 can find click in the site-packages directory under Python 2.7?