Check the Version of Arnold - Arnold User Guide

You need Arnold 5.0.1 or later to use Autodesk license. That means you need:

• MtoA 2.0.1 or later
• C4DtoA 2.0.3 or later
• HtoA 2.1 or later
• MAXtoA 1.0.832 or later
• KtoA 2.0.2 or later
• SItoA 4.1 or later

The Arnold plugins, like MtoA and C4DtoA, have About menu commands where you can check the version of the plugin. For example:

• In Maya, click Arnold > About
• In CINEMA 4D, click Plugins > C4DtoA > Help > About C4DtoA

You can also check the Arnold log for a render:

00:00:00    36MB         | log started Thu Nov  2 12:54:39 2017
00:00:00    36MB         | Arnold 5.0.0.2 [f2591180] windows icc-17.0.2 oiio-1.7.12 osl-1.8.2 vdb-4.0.0 rlm-12.2.2 2017/05/08 11:52:26
00:00:00    36MB         | running on EXAMPLE-07, pid=83052
00:00:00    36MB         |  2 x Intel(R) Xeon(R) CPU E5-2637 v4 @ 3.50GHz (8 cores, 16 logical) with 65412MB
00:00:00    36MB         |  Windows 7 Professional Service Pack 1 (version 6.1,build 7601)