I have a classic license for Sketchup 2020. Now I have changed computers and unfortunately I can no longer activate it there because I have apparently already carried out too many activations. I probably didn’t deregister Sketchup properly so that the license for the old computer is still active, I sold it so I can’t deactivate the licence. I read that Sketchup can reset the number of activated license. How does this work?
You must have made this mistake before because you have 2 activations per license.
Sometimes @colin is able to help if you ask nicely…
Your license has a more complex history than most. You should contact support, and they will see for themselves the various changes that have been made to the license.
One example change is that you requested it to be changed from a 2021 license to a 2020 license. If you no longer must use 2020, and could now use your 2021 license, it does have a spare activation. Support may be able to reactivate that version to solve your immediate problem.
You do also have a subscription that expires in June. You could use that instead, and it will work for 2020 as well as 2019, 2021, and 2022.
To contact support use this form:
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Hi @colin , if you can help me, i stumbled upon the same problem, of this thread. I own a Sketchup Pro 2020 license, and i reach limit of activations. I have not access to the old machines. Can you help me, or guide me to the correct channels for support?
Thank You!
Can you use the support link I gave? Tell support about not having access to your old computers. You have 2020 activated on three computers, do you not have access to any of them?
Thanks for the fast reply, yes i try to contact support, i will wait for their response. I have access only to one of them, i lost the one from my main workstation, and the other years ago, in the previous pc. 
I should be more careful about licenses manage, but i forgot that i have to desdactivate them.
Ouch, support says “You will need to download a newer version of SketchUp as the 2020 and 2021 versions are no longer supported. You can download the latest version in the following link.”, 
i can’t afford a new one 
That’s called a permanent license?
You can download SketchUp 2020 at the following link. Support is correct that the version is not supported and hasn’t been for several years. Keep in mind that the 3D Warehouse, Extension Warehouse, and other web-based services no longer support those old versions.
https://www.sketchup3d.de/download/center/#199-216-version-2020
I know support is correct, I have a permanent license of SKP2020, I was just requesting that they reset the license count since the old ones are lost if you lose access to the computer due to theft, failure, etc. Since they work differently than subscription base.
That’s exactly my case. I earlier this year I installed SU on a new MacBook laptop, but after a week I decided to return it because I didn’t like the system. Now I have a new Windows laptop and can’t activate SU because I hit the activations limit.
The email I got from your system says
Understanding SketchUp Pro Single-User licenses
Trimble allows license holders two installations of SketchUp with their Single-User license.
And this is what I have - one desktop computer and one laptop, which I can not activate SU on.
I did contact the support, but they told me to ask on the forum, and you’re saying to contact the support. I’m confused 
@Antoph and @cabeza I am looking into whether there is a better solution for the problem when people forget to remove licenses for versions of SketchUp that are no longer supported. I did do something that should have helped on both of your cases, so try adding a license again. Make sure to remove the license if you change computers in the future.
it work!, thank you @colin, you are the best! 
Thx @colin, it’s working! You’re awesome 