If you get

Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in I:\PP\public\index.php on line 50

error while installing Laravel 5, you are probably running on old PHP version – make sure to upgrade to 5.6.* and higher.

Crafting application...

Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T
_STRING) or variable (T_VARIABLE) or '{' or '$' in I:\PP\artisan on line 31
Script php artisan clear-compiled handling the post-install-cmd event returned w
ith an error

[RuntimeException]
Error Output:

run-script [--dev] [--no-dev] [-l|--list] [script] [args1] ... [argsN]

Application ready! Build something amazing.

Solution
Update to newer version of PHP.