Latest version is 1.0.16, here is a quote from one of the Elk people:
Original thread
The ELK Products M1 Dealer Website has a new software upgrade for the Elk-M1XSP Serial Expander Firmware - Version 1.0.16.
This software has several enhancements for UPB and other devices. The particuliars will be in the release notes available after January 9th
Original thread