Usually WHMCS installation is not a very complex process, but at times you have a hard time understanding the pre requisites for installation like system setting and environment required for WHMCS to run.
We have handles and troubleshooted dozens of installations so we know exactly what is required by WHMCS, and how to solve related issues.
You should keep your WHMCS area up to date which means you should apply all upgrades as soon as they are released. Missing out on this means you compromise security of your WHMCS setup. We provide WHMCS upgrade service so you can leave all worries to us.