KB: Get Viewer license
Solution Details
Viewer options:
View, print, and cross-probe single documents or entire projects in one comprehensive interface. With AD20.0.10 and newer versions, every Altium User account can activate a personal perpetual On-Demand viewer license exclusive to their individual Altium User account almost immediately, free of charge. You must be signed in with your AltiumLive account, but not using any other license seat. Here's documentation:
Getting an Altium Designer Viewer License
For versions 20.0.10 to 23.7, use the "Get Viewer License" control/link/button at the bottom of the license management page.
AD23.8 and newer doesn't have all the controls below the licenses, just find the viewer license that has no info, and click the "Get License" button.

Notes:
- The viewer license has no Expiry date and will be shown as Infinite. It does not have a subscription so the information shown in the Subscription Status will be "Expired on [the date it was downloaded]". The control for "Get viewer license" will be grayed out because you can only download one viewer license per AltiumLive user.
- Since the viewer license has no subscription, it cannot be used to update your version of Altium Designer because the program wants to save you the issues that arise when you've updated to a version that your subscription will not support. You can download/install our current (or an older) version from here: ALTIUM DOWNLOADS
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If you don't see the button for "Get License", either you already have a personal viewer license, or there is a viewer license in your organization's license pool (even if it is expired). You can have a Group Administrator for your organization use the company dashboard to remove allocations for any expired viewer licenses by following this Knowledge Base article: https://www.altium.com/documentation/knowledge-base/altium-designer/hide-old-expired-licenses or, you can install a version of AD between 20.0.10 and 23.7 to use the "Get Viewer License" control/link/button as described above. Versions 25.0.2 thru 25.7.1 have an advanced preference option to turn off the newer license management interface. With those versions, you can switch back to our older license management page by going to Preferences » System » General » Advanced button (lower right corner) » search for 2023 to quickly find the preference "System.LicenseManagement2023" » uncheck the box in the "Value" column, then restart Altium Designer. Then you can use the older "Get Viewer License" control. (Don't forget to switch back after you've got the viewer license.)
There's also an online viewer that lets you share the design with others:
Altium 365 Online Viewer View & Share Electronic Designs Online is a fast, simple, and reliable way for anyone to explore and share ECAD content, design, or manufacturing data quickly without installing any software. It can be embedded into your own website with a short HTML code snippet. It does not require CAD, and supports most of the popular CAD formats. Your design is available for the duration of your browser session and is automatically removed when you close your browser tab. Alternatively, you can choose to share your design through a link where it will be available to anyone with the link for a limited period of time. Altium 365 Viewer is completely free; more features become available once a user creates an account. Introducing The Altium 365 Viewer
If you are using an older version of our program, and/or the Online Viewer doesn't meet your needs, you can sign up to have a free 6-month viewer license added to your organization's license pool from here:
ALTIUM DESIGNER VIEWER
(If you need three or more, or a private server version, please contact your account manager)