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Issue
You have a single-user subscription, but you get ADLM error 20 in the licensing diagnostics:
kick -nostdin -v 1 -i /dev/null (1.27 sec) ============================== 00:00:00 66MB | log started Tue Apr 14 10:48:31 2020 00:00:00 66MB | Arnold 6.0.2.1 [088e32fd] darwin clang-5.0.2 oiio-2.1.4 osl-1.11.0 vdb-4.0.0 clm-1.1.2.132 rlm-12.4.2 2020/03/06 10:20:27 00:00:00 66MB | running on Gorans-Mac-Pro.local, pid=4055 00:00:00 66MB | 1 x Intel(R) Xeon(R) CPU E5-1680 v2 @ 3.00GHz (8 cores, 16 logical) with 65536MB 00:00:00 66MB | macOS 10.13.6 "High Sierra", Darwin kernel 17.7.0 00:00:00 66MB | soft limit for open files raised from 10238 to 10238 00:00:00 66MB | 00:00:00 66MB | loading plugins from /Applications/Maxon Cinema 4D R21/arnold/bin/./../plugins ... 00:00:00 66MB | loaded 5 plugins from 3 lib(s) in 0:00.02 00:00:00 66MB | [kick] command: /Applications/Maxon Cinema 4D R21/arnold/bin/kick -nostdin -v 1 -i /dev/null 00:00:00 66MB | loading plugins from . ... 00:00:00 66MB | no plugins loaded 00:00:00 67MB | [ass] loading /dev/null ... 00:00:00 67MB | [ass] read 0 bytes, 0 nodes in 0:00.00 00:00:00 67MB | 00:00:00 67MB | authorizing with license manager: user ... 00:00:01 75MB WARNING | rendering with watermarks because of failed authorization: 00:00:01 75MB | [clm.v2] ADLM (20): Generic license checkout error 00:00:01 75MB | environment variables: 00:00:01 75MB | ARNOLD_LICENSE_ORDER = (not set) 00:00:01 75MB | ARNOLD_LICENSE_MANAGER = (not set) 00:00:01 75MB | [rlm] solidangle_LICENSE = (not set) 00:00:01 75MB | [rlm] RLM_LICENSE = (not set) 00:00:01 75MB | [clm] ADSKFLEX_LICENSE_FILE = Gorans-Mac-Pro 00:00:01 75MB | [clm] LM_LICENSE_FILE = (not set) 00:00:01 75MB | 00:00:01 75MB | 00:00:01 75MB | releasing resources 00:00:01 75MB | Arnold shutdown
Solution
ADLM 20 is a network licensing error.
Run this command to set the license type to Single User instead of Network:
/Library/Application Support/Autodesk/AdskLicensing/Current/helper/AdskLicensingInstHelper change -pk C0PL1 -pv 2020.0.0.F -lm USER
If you still have problems, get a list of the registered options and send that to support:
/Library/Application Support/Autodesk/AdskLicensing/Current/helper/AdskLicensingInstHelper list
Issue
You click Install to install single-user licensing, but the Arnold License Manager still says that Single-user licensing is not installed.
Solution
Uninstall all licensing components and try again.