I am having similar installation problems.
I think geeks deliberately explain installation issues in a way non-geeks will never understand so that have to pay geeks for the installation.
I have never been able to download and install a Joomlart template in the way explained.
In the end I had each time to pay a geek to have it installed correctly.
They usually don’t tell you what was the problem so that the stupid non geeks come back and pay again and again.
Yea – it is the law of the jungle even in Joomla communities. Teach a man how to fish is just a Ghandi wishful thinking.