The Power Excel Client can be installed in two ways, through the PowerOLAP Web Server pages, pictured below, or through the Control Panel's Add/Remove Programs.
To install from the Server pages:
Type in the name of your server into your Internet
Explorer Browser.
The PowerOLAP Server pages will appear.
Click Downloads on the navigation bar.
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On the Downloads page,
select the PowerExcel icon, as shown below.
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Next, Run (or Save and then Run) the
setup.exe file.
You will be prompted next by the InstallShield Wizard
dialog box to Accept license and maintenance agreements, then you will
be prompted to choose your Client Components.
Select PowerExcel.
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Restart your computer to complete the installation.