Oops...Sketchup 2018 Pro won't recognise legitimate serial number

I am trying to move my Sketchup 2018 installation to an other computer before updating to SU2021. When I try to add the license, I get an “Oops… that doesn’t look like a valid Serial Number and Authorization Code combination” message. I have a Classic license that has been upgraded to SU2020 and 2021 under the maintenance and support plan. I have not installed or licensed 2020 or 2021 yet, so I thought I would still be able move (remove and add license) SU2018. When I checked the License Manager, my 2021 serial is listed in blue, underneath is my 2020 serial in grey with “On Hold” in brackets, but my 2018 serial is not listed. Can anyone explain what my options are in this situation?

It does look odd. I put your 2018 license into a state where you should be able to activate it on the new computer, at least until you activate 2020 or 2021. Finish activating 2018, then 2020, then 2021.

Wow, I wasn’t expecting a reply that quickly - thanks. I must admit I was hoping that you were on the case, as judging by the forums you’re the man to sort these things out!
And sort them out you did - I was able to archive and update as planned with no issues.
Thank you for your help.

hello, I am having the exact same problem as mac_6. i had the “no internet connection” issue first, go that fixed only to hit this road block any chance you might be ale to help me, also @colin ? many thanks!

I had to think about what was the roadblock you were talking about.

You have a 2019 license that you never used. I’m guessing you’re tryin to get 2018 going, but using your 2019 license. I could give you your 2018 license, but is there a reason you couldn’t use 2019?

If the serial number you are trying starts with a U, that is your 2019 license. If you don’t mind installing 2019 and use that license with it, here is the Windows installer for 2019:

https://www.sketchup.com/sketchup/2019/SketchUpPro-en-exe

Install that, and add the license that starts with U, and its matching authorization code.

If there is a reason you need to stay with 2018, let me know, and I can give you your 2018 license details.

THANK YOU COLIN!! I didn’t realize I was attempting to use a 2019 license with the 2018 version. I never downloaded or installed 2019 so all I had was the 2018 .exe file.

I used the link you sent and installed 2019; it accepted my serial number and authorization so all seems ok.