Package Update without Internet Access on Host

[pythonator]

I can't seem to find an answer to the question of how to update packages when I cannot use pip due to no internet access on box. I have been installing new packages from source using the python setup.ph install method with success. But how to I update an existing package using a similar method? If I just install a newer package will it replace the older one or am I going to end up with two versions installed? Or worse?

Thanks.