2nd Time trying to Install and Connect Concrete5 - 2nd Failure
First Attempt: Uploaded all the install files via FTP etc, followed all protocols and instructions to the "T" - DUD! couldn't access additional themes etc via the community - said my site wan't connected, couldn't successfully log in etc.
Second Attempt: Used Hostgator's one click install.... same stupid result, with massive CSS bugs as well.
With performance like this: I prefer all the update bugs of Wordpress
<barf>threw up in my mouth when typing that</barf>
I am sure I could use this CS with only the pre-installed themes: but what the hell fun is that!?
As far as versions go, while the latest and shiniest can be good, if you have a limited host account, 5.6.x can be an easier choice to get started with. Its a fraction of the size of 5.7+ and requires less resources. The disadvantage is that any issues are less likely to get attention from the core team, so issues with community connection may not be resolved quickly.
Looking at your screenshots, it looks like you have a successful install, but the problem arose later in connecting to the community and marketplace. You can (and many do) leave a site unconnected and install packages and themes manually.
If it is your first c5 site, its usually best to not install anything for a while and learn your way round what you already have with the sample content. Then, once you have learned your way round, you will have a clearer idea of what addons & theme you will need.
I just removed all the failed projects from my concrete5 account. I removed the test subdomain, and wiped all files of said domain.
I then created a new 'test2' subdomain, ran the webhost's script to install concrete5 Version 18.104.22.168 under said directory. Once I came to the dashboard, and was cued to 'connect' my site to concrete5.org..... check out the screenshot. Same sh¡t, different day
The project does now appear on my Concrete5 account, but whoopty-doo. For sh¡ts and giggles, I am going to try again to connect in this crap form/iframe thing..... Nothing
Now I reload my test2 site - I go to the dashboard - click on themes - 'more' themes - I am cued to connect the site, which I had already done and is visible in my projects. But I connect again anyways.... now there are 2 identical projects listed.