Anaconda is not going to work, they compile their modules differently with respect to library relative paths.
https://pypi.org/
Would be the most prominent site to ensure you have access via pip.
If you have a proxy server in the way, you may also need to have your corporate SSL certificates installed where Python can find them. Many companies proxy servers use local certificates and unencrypt your SSL connection between your machine and the proxy to inspect the http traffic then use their certificates to reencrypt to the site. Corporate man-in-the-middle. This may also be causing issues especially if the corporate certificates are self-signed rather than purchased. Hence not being able to validate a certificate chain.
If you can't install packages from the command line ( say you have installed Python 3.11.x and just use pip ), the JMP won't have any better luck. JMP's jpip is just a wrapper over Python's pip to ensure that installed packages go into JMP's isolated environment. If they don't prevent flash drive usage, you could create your own site-packages directory on another machine say home computer using Python 3.11.x for JMP 18, or 3.13.x for JMP 19EA. Then replace your %APPDATA%\JMP\JMP\...\site-packages directory with the one you have created.
This is also the way to 'cheat your way' to virtual environments for JMP 18 and 19. Swap between saved site-packages directories and restart JMP.