Can't use Elements 12 after computer replacement

Question

When I start Elements 12 I'm requested to log in and registrate my Adobe Photoshop Elements 12 within 7 days otherwise the product will stop working.  This will not help. I have bought(cash) and used Elements for at least 11 years on my old PC. I have now installed Elements on my new PC, but I  can’t  start my Elements. 
The old PC  does not work anymore, so it is impossible to deactivate Elements.
What can I do?
 
Serial no [removed by moderator]
Registrated in feb 2014
/Mats
[Personal information removed by moderator.]

Greg_S. · Answer

Try removing your computer from the internet and activate online using the instructions found in this article.

(The current article is not available at the Adobe site. I hope this is not an ominous sign that the activatation by this method is not working. My link is therefore to the article found on Archive.org. It may take a little while to load.)

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