ARM 2017 is the 'current release version' for 2017 field season. ARM licenses are under maintenance, with all program updates and upgrades delivered automatically via internet.
ARM 9 is obsolete and no longer supported, the same as all older ARM versions. Upgrade now to receive support if using an unsupported version.
Beginning with ARM 2015, GDM software requires online activation and is limited to one computer installation per license. (TDC includes one additional activation to install your ARM license on a second computer). When moving ARM to a new computer, simply deactivate ARM on the old computer.
Please note that within a software version listed below, GDM gives free support only for the most recent free maintenance update. Users should always install the most recent free maintenance update before contacting GDM for support. (See the Updates page to update ARM and ST.)