You may need to know your the version and build number of your GeoExpress software in order to communicate with LizardTech Support. To find these numbers, use the -version/-v switch as follows:
mrsidgeoencoder -version
This will return several lines that may look like this:
Using commuter license issued from server: 10.0.17.5 Version 9.5.4.3325.default (64-bit) (Oct 11 2017, 01:51:53)
In this case, the version number is "9.5.4" and the build number is "3325".