If you are with an educational organization, I would suggest you contact the person managing the licenses at your organization to see if they can fix it. It that is not possible or the case, then you have no other option but to contact tech support.
I agree with Dan that this might require contacting your educational institute or tech support direct. (Edit: thought you were “out of country” but re-read it and just “out-of-state”, so deleted my note on that.) If you don’t have an internet connection, there are ways to authorize offline
How To: Authorize ArcGIS Desktop 10.x Single Use offline
Im not at a computer to check, but if it was authorized and working on this machine (which it sounds like it was) you may be able to find the authorization code in \program files\arcgis\license\bin. Or in your username\appdata\<local or roaming? >\arcgis ... etc. Again, not near my machine so trying from memory. Some of the folders/files may be hidden by your system by default, so may need to work with settings.
but all that also assumes that there isn’t some other issue that is causing the issue. I have never encountered that error myself....but also have never used an educational license, so by no means an expert.