How to create exact Blog Template from main site?

First I installed the Blog Templates and created one from main site beside on a page is written it is not possible.

After some problem I reinstalled MultiSite and I cannot do it anymore.

I really need this, I have a whole template with ElegantThemes settings and some more customization.

How I can create template from the main site or just copy the whole template with all of the plugins, settings and all the stuff