Log into the Backend side of your Joomla

Navigate to the cACL. Once you have logged in, hover over the Install link on the top taskbar, scroll down to cACL:

When you have selected the cACL, you will be sent to the Access Menu Item that lists all Administrators.

Select an Administrator depending on whether you want to set limitation (here is giangnt )

When you have selected the Administrator (giangnt), you will be sent to the cACL manager page:

Select tab Install to set installation access level.

There are 3 options to control Installation access level (Allow; Hide, Restrict). For setting up, you select one option colerrative one element of Install. Default is allowed for all.

For this example, you allowed giangnt to install Modules and Mambots but not allowd to install any Components.

After that, you could choose Save task or Cancel task to save or cancel and back the previous page and set up other administrator or if you choose Apply task to Save and continue setting other limitative functions. 

The Result

Here is the result when giangnt have logged into the system:

There are some differences between before limiting and after limiting:

Before limiting: giangnt could install all components, modules and mambots.

After limiting: giangnt couldn't install any Components