Can't Access Maven Repository

My gradle builds are proving unsuccessful because I do not have access to the maven repository on the computer I'm trying to mod on, and I would like to know if there are any alternatives I can use to set up my workspace on this computer.

My old computer science teacher wants me to set up Minecraft modding on all the computers in her lab so her students and comp sci club kids can play around with it and learn from it. This would all be fine and dandy if it weren't for the restrictions set upon all the computers. Getting the JDK was the first issue, because without administrative access (a luxury even the teacher does not have), the JDK installer would not run. I ended up installing a Windows port of OpenJDK that seems to work, but I can't be certain because of this gradle issue.

The minecraft forge website is blocked on all the school computers. Getting the source file was easy enough with a jump drive, but I haven't been able to transfer anything else using this method. Finding all the files that gradle downloads from the repository feels like herding cats, and I'm not certain transferring them between users would work anyway.

Is there any way I can access the repository from somewhere else or transfer the relevant files between computers? Or, alternatively, is there any way the IT can run gradle so the dependencies can be accessed by every user on the computer?