Can not install, auto redirect to domain.com/install/?a=install/?a=install/....

[nk2klove]

and i get

500 Internal Server Error​

---

I use nginx, chevereto_3.16.2. used to few months. but can't update and view pictures, so i deleted all and reinstall.
Use installed.php -> step Detecting existing cPanel .htaccess handlers and... no more
Use by upload code:

500 Internal Server Error​

Please help!!! Thanks

 

[Rodolfo]

I don't use the "a=install" query string, what kind of server setup you have?