UPDATE 3:56MDT 11/10/2017:
We have a fix in place for this issue. We would love to get some quick feedback from anyone who was having this issue, if you could please see if its resolved. Here’s how:
SU 2017: Open the Extension manager and find the extension(s) with the License Error message. There should be a button that says “Update Extension” visible. Click that and wait for the page to refresh. That should fix the problem.
SU 2016 or earlier: You will likely need to uninstall the extension through the Extension Warehouse, and then reinstall it. That will delete the extension that did not have a valid license, and the reinstall will push a new valid license onto your machine.
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Hey everyone, we’re getting a lot of reports from users that the Extension Warehouse is not issuing licenses for Paid extensions the way it should. We’re still trying to get to the bottom of the problem, but it appears that it is affecting all Paid extensions.
If you purchase an extension, you will probably get a warning that no license was found
If you try to install a Paid extension that you already own onto a new machine, or a new version of SketchUp (ie 2017 upgrade) - will also probably get a warning that no valid license was found.
For now, it is recommended to not try to install Paid extensions, as there will likely be License problems.
We are actively trying to understand what is causing this problem so that we can work on fixing it. Consider checking back on the status of this thread every 24 hours - I’ll keep the status posted here.