Installing Specific Laravel Version Using Composer

 composer create-project laravel/laravel=5.5 lav55fresh --prefer-dist

Example:

Showing Composer Package Version

"composer show [package-name]". Ex :

Specified key was too long on php artisan migrate laravel 5.5

Solution :

Result :

Yeeeeei.... :D

RuntimeException No application encryption key has been specified - Laravel

 Solution :