Ugdhar

Please read the FAQ on how to post logs. You have client mods trying to load on a server, which will not work. The one that stuck out was sodium client extras, there may be others, they would probably be easier to find in a log post the way the FAQ describes.

That looks like it!

The company that made the graphics device, as far as I can tell it appears to be using AMD Radeon graphics.

That log still says something is already bound to the port. If it's not showing anything running, perhaps there's a stale lock file or some other strange thing going on. If possible, perhaps a server reboot?

Can you post a new log? Just don't want the port in use error to be the cause of the server not starting:)

From the original log you posted: Check that another minecraft server isn't running on that machine using port 25565

I don't see a crash in that log, is it the complete log? If not, try reposting it

Please post logs as described in the faq, they contain more useful information.

Please post a log as described in the FAQ, it may have more information to help.

Have him update his video drivers, from the manufacturer website, not Microsoft update, and see if that helps.

See the FAQ, cracked launchers are not supported, buy the game.

Possibly, but to be honest I don't think I've ever seen a modpack that didn't have a ton of warnings and non-fatal errors, due to poor coding and incompatibilities between mods. So is it the server or client crashing?

Is it the server or client crashing? That server log doesn't show a crash that I can see, just the client logging in and disconnecting. If the client is crashing, post that log

Please see the FAQ (https://forums.minecraftforge.net/topic/125488-rules-and-frequently-asked-questions-faq/) for how to properly post logs. Make sure you share the entire log, and not just part of it.

More information is needed to find the solution, logs, console output, and/or errors that are occurring.