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RadiAnt DICOM Viewer - Discussion Forum
How to reactivate the program

Oct 11, 2021 10:45 AM
by Vasily
hello. the radiant program was installed on windows 10. the operating system was upgraded to windows 11. the radiant program worked well, but a week later it requested a license entry. I entered the license number, but the program could not connect to the activation server. I activated it through the site, and the site replied "Activation error: 404
2021-10-11 09:42:00

All available licenses are active.
You have to purchase additional license or deactivate your old computer.
How do I reactivate the program?
Oct 18, 2021 08:48 PM
by RadiAnt
Hopefully you contacted us directly or figure that out earlier :-)

To access your product keys, download links, and manage activations please go to
Please sign in with the email address used when purchasing licenses.
Click "Show activated computers". There you will be able to deactivate your old machine/system.
Click "Deactivate this computer" for the machine you want to deactivate. Then you can activate your new computer/system.
Nov 4, 2021 04:11 PM
by Mooh
I got the same issue. I run my paid RadiAnt on Mac (using CrossOver). Every time I run the program, there will be a pop-up window asking for the license number. I put my serial number, but the program could not connect the activation server and showed "activation error: 404
All available licenses are active....

Then I did deactivate once which is the same computer that I use RadiAnt. And I could put my license. However, after a couple of days, the pop-up window asking for the license number came back. It bothered me so much. Because I paid for the license, but I couldn't use it.

Please help
Nov 4, 2021 09:15 PM
by RadiAnt
When using RadiAnt with CrossOver, please use the latest 2021.1 version, it might give less activation issues with Wine/CrossOver.
Remember that we do not officially support RadiAnt on platforms other than Windows and we warn that some problems can exist.
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