The G610 had been updated a while ago. The GDrive had been added to all programs. In case you didn't receive the notification via e-mail, please download the G610 again from your download area at http://gemini-audio.net.
Just out of curiosity, I don't actually need an answer , but I was reading the manual and installing the library and it's the first time that bumped into this ROM.mxl file substitution. Is that for a technical reasons?