Step 1: Hit the following link to Login into your Client Area i.e. https://members.whmcsglobalservices.com/clientarea.php
Step 2: Now go to your services and click on Clientx WHMCS Template Service
Step 3: Then click on, Download the ClientX Theme on the according to your WHMCS version and php version

Step 4: Once you have done that a zip file will start downloading.
Step 5: Extract the downloaded zip file

Step 6: Now, connect to your local FTP Client example: FileZilla, cPanel, etc using your credentials
Step 7: Open the extracted folder in your FTP client while connecting to your WHMCS setpup.

Step 8: Double click on the extracted folder to get into the dircetory where you will see the three custom pages highlighted in the screenshot below(left side)
Step 8.1: Upload these three pages to root directory of whmcs, rename these pages by removing "_new" so that our files will look like this screenshot below(right side).

Step 9: Now open the templates folder on both side extracted build and WHMCS setup

Step 10: Upload clientx-child folder to your WHMCS setup (whmcs_root/templates/).

Step 11: Now open template/clientx-child/custom_files/ remove "_new" from the files so that its look like as our setup

Step 12: Open orderforms folder on both side i.e the extracted build and your WHMCS setup side

Step 13: Upload cartx_child folder to your WHMCS Setup under orderforms folder (whmcs_root/templates/orderforms/)

Step 14: Open addons on both side i.e extracted build and your WHMCS setup side

Step 15: Upload clientx folder under WHMCS setup addons folder (whmcs_root/modules/addons/).

Step 16: Go to the lang folder on both side i.e extracted build and WHMCS setup.

Note: If you have already overrides folder under your lang folder. Please skip next step [step17] and follow this Link for language setup
Step 17: Upload overrides folder under lang folder over your WHMCS setup (whmcs_root/lang/overrides).

Now all files are uploaded. Lets configure the theme and addon module
Step 1: Go to WHMCS admin > click on this icon as shown in the screenshot below

Step 2: After clicking on the above icon , click on System Settings.

Step 3: In the Search bar search for the Addon Modules then click on at "Addon Modules".

Note: If you get OOPS error after clicking on Addon Modules, please follow this Link to rectify it.
Step 4: After that you can see the list of all available addon modules. Find “Wgs Clientx” Addons module.
Step 4.1: Further click on the Activate button to activate the "Wgs Clientx" Addons module.

Step 5: After clicking on activation, please select configure button to configure the module.

Step 6: Now, put the License key in the field provided and give access right to the user groups and then click on save changes.
Step 6.1: To get the License key Login with your purchase services in your WGS account at the given Link.

Step 7: Now you can see the Addons module will be listed here in the Addon section under your Wgs Clientx as shown in the below screenshot.

Note: Now Clientx Addon Module is configured lets Set Clientx Child theme as default template and Cartx Child as Default orderform
Step 1: For this click on the System Settings.

Step 2: In the search bar search for the General Settings then click at "General Settings".

Step 3: After clicking on the general setting, further click on the General tab then select the clientx theme from the dropdown list.

Step 4: After the above step now click on the ordering tab to configure the orderform.

Step 5: After clicking on the ordering tab, select Cartx Child(Default) option and then click on save changes button below to activate the orderform.

Now Clientx is configured you can check client area!!!