How to generate an OAuth 2 refresh token

I am trying to connect to the Google Ads API, so I will be able to manage campaigns and apply rules to them but to maintain a connection I need an OAuth Refresh Token. In the Google documentation, it says to install the OAuth2l but I was not able to install it.

Is there an alternative way to generate a refresh token?

Note: I tried to install the OAuth2l from the git link in the Google documents but it was not successful!