Unable to Install
If the installer wizard is not loading or showing errors that probably means your server doesn't meat the minimum requirements of the script.
You can easily validate the minimum requirements by visiting the check.php file we have in the public directory. If you have are installing script on root then your validation URL will be http://www.yoursite.com/check.php and if you are installing script in sub-directory simply add the name of director in URL and your URL will look like this: http://www.yoursite.com/sub-directory/check.php
You need to ensure that all the above shown Extensions/Settings are ticked green. Contact your hosting to fix the red ones.