Win 10 and Win 7 File Sharing

I have one Windows 7 computer on my network that shares a license to the other windows 10 computers. I have been over everything ensuring that share options on both ends are correct. Most of the time all the computers can connect and use the license after the Win 10 PC gets restarted, but as it gets further from the restart it seem that they lose this connection. Some computers lose it faster than others. Keep in mind all the PCs are set to never go to sleep. While a restart does seem to temporarily fix the issue someone doing that every time they need the program is very time consuming. The connection also dropped while they were using the program and it crashed which is pretty much the worst thing that could happen. We cannot seem to move just simply move the license file as we get a "cannot find server" message when that is tried. The program is GibbsCAM if anybody knows how to move those licenses. That will be my next google search. Thank you