Yesterday I installed self-hosted N8N for the first time. After receiving the license via email, when I try to upload it, I get the error “Activation Key has already been used on this instance.” Can anyone help me?
Hi @Simo007 Welcome!
For this issue, first consider checking that if the instance is already registered or not, via:
Settings → Usage and Plan → if it shows [Registered] means it already is.
If it does not, then you have to manually clear the license with:
docker exec -u node -it [n8n-container-name] n8n license:clear
and then just restart your n8n container and once it boots up re enter your key there, and let us know if that works or na.
@Simo007 YES! You are right, you dont have to do anything your n8n community license is already activated! Look here at what it gets you:
Cheers! Consider marking that as a solution if it helped!
Hey Anshul
Thank you so much for your help. You’ve been very kind. 
Have a great day!
Also @Simo007 i have wrote a short article on community edition features, you can also check that out here:
