using github laravel 5.2 projects

when am trying to download larvael 5.x projects from github and trying to use it

i got these two errors :

 Warning: require(C:\wamp\www\laravelshop\bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in C:\wamp\www\laravelshop\bootstrap\autoload.php on line 17

Fatal error: require(): Failed opening required 'C:\wamp\www\laravelshop\bootstrap/../vendor/autoload.php' (include_path='.;C:\php\pear') in C:\wamp\www\laravelshop\bootstrap\autoload.php on line 17

is there anything i need to modify first after downloading any project , before using it ?

via Chebli Mohamed