The quickest way is to use a USB stick with the log magic file on the root of the stick. The magic file can be found on the UR support site.
It it is possible to SSH into the robot and then get whatever you want from the files. We've mounted a remote directory on the robot before, I didn't actually do it so not super clear on what it took to do it but it allowed us to access files from a different computer.
Can you connect to the robot and gather the log files through ethernet or FTP connection?