LumenRT Update 4 - add-ons in Archicad (18 - 21) not working (


as smooth as the integration in Archicad was, and as eagerly as I was looking forward for the tech upgrade no 4, as annoyed am I to see that now none of the Archicad plugins are working: I am on the German version of ArchiCad, and in all version the add-on is disabled after start-up, "please contact the distributor"

Let me underline that whilest working, the link from ArchiCad to - now Bentley - LumenRT was a great feature and enabled us to continually visualize our progress for the client, as all scenery added was maintained; we thus could do regular updates from our updated and enhanced AC-Model ...

Please get that fixed

best regards

S. Hybner

  • Hello Siegfried,

    We are making automatic tests on LumenRT with Archicad 19 regularly and we didn't find any issue.

    Perhaps a complete re-install of LumenRT could solve the problem:

    Please go in C:\Program Files\Bentley\Bentley LumenRT CONNECT Edition - Update 4\Uninstall

    Execute Uninstall.exe

    Then re-install LumenRT with the setup.

    If that doesn't help, could you try to install LumenRT on a different computer ?


    Best regards,


  • Hi Siegfried,

    Very odd that this is not working for you.  It works fine with AC 18 - 21 on my end.  I'm wondering if there is some sort of security issue blocking the plugin on your end.

  • Hi David,

    yes, this is odd; but as a simple user it is understandable that I do address it here.

    No, I have deactivated all virus scanner, I have by now done multiple installations on PC or laptop, connected directly to Internet or not

    I have posted the attached information to my ArchiCAD support,maybe their handling of header information for your developer information is misinterpreted in the localized version of ArchiCAD

    But I do think it's up to Bentley to get that fixed ... I have paid support, I do want to use the program; and last but not least: I appreciate your support for this wonderful piece of software ...

    AC21_LumenRT deactivated

    Do you expect me to test it with the international version of Archicad ? I will give it a try, but have to find time for that ...

  • Hi David,

    let me add an update to my reply today:

    - I reinstalled, tested, took time and care; installation process was done as admin once, as user twice, but basically this did not change the behaviour of the add-on: it is listed as deactivated ... 

    - Add-On works in ArchiCAD 20 ;-)

    - I contacted Graphisoft for this issue, they reply that this is a problem to be solved by the developer of the add-on ... understandable, isn't it ?

    - I downloaded the international version of ArchiCAD 21 -> add-on does not get activated, I have updated from the original ArchiCAD 21 release through to the most recent version

    so I cannot see a possiblity to tweak the ArchiCAD part of this interface;

    leaves me with the question, whether or not the localized WIndows version (Win10 64bit German) has something to do with this ...

    I might test this on the weekend ... but I would appreciate forwarding any suggestions as well as Bentley looking into this

  • Hi David,

    after extended tests I found something, which is almost a solution:

    The add-on works smoothly if I start ArchiCAD without dongle, thus in Demo-Mode; I happened to do this by error and was sublimely surprised, after having done almost every imaginable kind of trick (as mentioned before ...);

    I do attach screenshots as to show the difference after startupMenu in "Demo-Mode" - LumenRT cleanly addedlicensed mode - LumenRT missing ...

    I do address Graphisoft now with this bizarre behaviour, and I am looking forward to reading and sharing their response;

    and so please accept my apologies for being mislead as to the functionality of the add-on, but this was really tough to discover ...