This is not a solution to your problems, but you should understand that DNN is actually at least 2 things.
The first is the DNN Platform open source project is "owned" by the dotNet foundation, and is maintained by the (somewhat loosely organized) DNN Community, the owners/creators/maintainers of this website. "All things DNN" are the product of this community effort. IMHO, the DNN Community and the DNN Platform are thriving. The community is most visible here at dnncommunity.com.
The second thing is DNN Corp,, which donated the DNN Platform to the dotNet Foundation, is owned by ESW Captital, and markets DNN Evoq which is a series of projects built on the DNN Platform. Evoq is a commercial version of DNN Platform, and includes custom extensions for the various versions of Evoq. DNN Corp is at dnnsoftware.com and does run the DNN Store at store.dnnsoftware.com.
This does make things a little confusing, especially to newcomers.
So, if you are interested in the open source product, this is the right place. If you are seeking support for the commercial Evoq prodcuts or want to purchase, you'll need to contact them. I'm told that latter part isn't always easy.
Because Evoq is built on DNN Platform, we can sometimes help you solve platform-related problems. Paying customer have access to Evoq's support team.