ARM 2019 is the 'current release version' for 2019 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ARM 9 is obsolete and no longer supported, the same as all older ARM versions.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. When moving ARM to a new computer, simply deactivate ARM on the old computer before installing on the new computer (see Transferring ARM to a New Computer (pdf)).
Please note that 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 software.)