As a shared hosting company, it is nowadays almost required to provide one-click installable web applications to your customers. Packages like Joomla, OS-Commerce and WordPress come to mind.
Providing the installation for this isn’t hard. You can simply copy a directory and redirect. The real problem lies in managing the installed applications. You nor the customer wants to have an outdated version and since you provided the installation you need to provide the upgrade.

The ideal situation would be if Joomla would be installed at a central location, which would be used by all customers. Only configuration files and additional support files would be in the configuration directory. Keeping in mind that you, or at least we, don’t want to set additional limits to our customers, support files include additional languages, modules, etc.
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