I have Elements 10 (Yes, I know it is old, but I don't use it much so I don't want to buy a new version!). I have just bought a new PC. I uninstalled Elements from my old PC, but now I can't install it on my new PC. It says my licence number is invalid (and, yes, I have rechecked my typing several times).
Go to Adobe Customer Service (make sure to sign into your Adobe account first) and only ask to have your activations reset: https://helpx.adobe.com/contact.html?rghtup=autoOpen will automatically open the chat window. Type "Agent" in the chat box to bypass the chatbot and be connected to a person.