New loaded project can't find robot-selenium library

my computer crashed, I reinstalled environment and loaded an existing project. The project cannot recognize the robot-selenium library. I found from Python Interpreter that all libraries were installed in c / Pytonh36 folder and my project is in another one. I click + to add / install the packaged library to this project, but was getting the message “Error downloading package: connection reset.”
The proxy connection looks fine. Can I install excel library (pip) and give some specific direction? … Can I just copy the existing library folder to a new location?