On a new domain i installed via Direct Admin Joomla 5.02 and got no errors
But after installing joomla template fago and selecting this joomlatemplate as default i get an error 500 page
Can somebody can give me an explanation ?

So these are only the first steps so nothing else installed

You have to install the Astroid-Framework-Plugin 3.0.9 too:

See also the documentation:

www.joomlaplates.com/documentation.html