Hello @Sharpy
first of all I would like to suggest that you read the community guidelines. FAQ - Checkmk Community
This is a free community forum. Please keep this in mind.
When communicating, please always try to be guided by the values of respect , fairness , sensitivity and constructive criticism
You can’t download the Enterprise Version unless you bought the product. After the purchase you will get login details for the Enterprise Download URLs. If you have an active subscription and you don’t remember your login credentials please open a support ticket at Checkmk or your Checkmk Partner.
If you don’t have an active subscription then you can’t download nor upgrade to the full enterprise version. If you want to test the Enterprise Version you can download the Free / Trial from the download page → Download Checkmk for free | Checkmk
Regards
Norm