1. Download HMVCI (codeigniter core system excluded)
2. Download Codeigniter core system v2.x from official site (recommended to use v2.2.5 or below instead)
3. Put system folder from Official Codeigniter inside HMVCI folder or else, just make sure SYSTEM_PATH in index-sample.php are pointing to it.
4. in root directory, rename index-sample.php into index.php
5. in application/config directory, rename config-sample.php and database-sample.php into config.php and database.php
6. Done!

For official codeigniter, default route are pointed to welcome controller. But here, in HMVCI, default controller are pointed to {APPPATH}/controller/basic.php, you still get the welcome message from codeigniter. It just renamed file because welcome controller are used in the modular.

You can access the main welcome here:
http://{your_host_domain_and_path}/index.php
or
http://{your_host_domain_and_path}/index.php/basic

You can access the modular welcome here:
http://{your_host_domain_and_path}/index.php/welcome