Sign in
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.
Post reply
Author (first name or pseudonym):


Captcha image

Visitors can post messages on the forum without having to register. Please input your first name or pseudonym in the "Author" field. Do not publish any personally identifiable information (PII).

Please ensure you write your posts in English so that our international audience can understand and reply to your message.

The Administrator reserves the right to remove any messages that violate our forum rules; for example, those that are not related to the RadiAnt DICOM Viewer software, published in a language other than English, contravene regulations, etc.