How to fix error while installing laravel?

Question

Composer

Answer 1

enable proxy.
falls off periodically from Russia composer

Answer 2

I think the problem is that your username is in Russian, the open server console itself is no longer friendly with Cyrillic at all, and then, apparently, there are consequences with the inability to download, because it cannot determine the path to save (in the user's home folder) , so it throws an error.
And yet, the current version of Laravel requires php at least 7.0+.
I recommend working as a user who originally had a username in Latin (or go through a small dance procedure with a tambourine to rename the current one correctly).
Abandon open server and switch to either Laravel Homestead (a wrapper over Vagrant - virtual machines for development), or Docker (there is a convenient laradock build ).
Probably easier with Laravel Homestead