You won't be able to downgrade from the OS X version that came pre-installed on your system (OS X Yosemite) especially new hardware as the prior version of OS X may not have the drivers needed for the new hardware.

Mac OS X Mavericks Server (10.9): How to Generate a CSR Using the Server App. Open the Server App. In the Finder window, under Favorites, click Applications and then double-click Server. In the Server window, do one of the following options to select the server on which you want to create your CSR. Note: You should select the server on which. OS X 10.9 Mavericks - the latest update to Apple's desktop OS - noticeably improves the overall experience on for both new and older Macs.Pros:Free: Mac OS. Mavericks (OS X 10.9) is here! And just as with Lion (OS X 10.7) and Mountain Lion (OS X 10.8) before it, getting Mavericks is as easy as downloading an installer from the Mac App Store.

There's an exception from above. For example, I purchased a late-2012 refurbished Mac Mini from the Apple Store. It came pre-installed with OS X Mavericks, but I was able to install OS X Mountain Lion from a USB ML installer. Maybe I was lucky that the hardware on this Mac is supported in Mountain Lion.
Oct 30, 2014 7:33 AM
If you have not yet created a Certificate Signing Request (CSR) and ordered your certificate, see
Mac OS X Mavericks Server: SSL Certificate CSR Creation.
Mac OS X Mavericks: Installing Your SSL Certificate
To install your Mac OS X Mavericks SSL Certificate, complete the steps below.
Mac Os X Maverick Download
Install your SSL Certificate.
Assign Your SSL Certificate to Services.

For Lion Server (10.7), please see SSL Installation Instructions for Mac OS X Lion Server.
For Snow Leopard Server (10.6), please see Mac Server 10.6 SSL Certificate Installation.
Mac Os Mavericks Download

Mac OS X Mavericks Server (10.9): How to Install Your SSL Certificate
Installing the Certificate
Open the ZIP file containing your SSL Certificate and save the SSL Certificate file (yourdomain_com.crt) to the desktop of your Mac server.
Keep this folder open so that you can readily access your SSL Certificate (yourdomain_com.crt) and the DigiCert Intermediate Certificate (DigiCertCA.crt) files.
Open the Server App.
In the Finder window, under Favorites, click Applications and then double-click Server.
In the Server window, do one of the following actions to select the server on which you want to install your SSL Certificate.
Note: You should select the server on which you created the CSR.
To install the certificate on this server
Select This Mac – YourServerName and then click Continue.
Enter your Administrator Name and Administrator Password and then click Connect.
To install the certificate on another server
Select Other Mac and then click Continue.
Enter your Host Name or IP Address, your Administrator Name and Administrator Password, and then click Connect.
In the Server window, under Server, click Certificates.
On the Certificates page, double-click on the Pending certificate that you created when generating the CSR.
On your certificate’s page (i.e. www.yourdomain.com), under Certificate Files, in the Drag files received from your certificate vendor here box, drag-and-drop your SSL Certificate (yourdomain_com.crt) and the DigiCertCA.crt files.
Hold down the command key, select both files, and then drag them to the box and drop them.
Click OK.
Assigning the Certificate
In the Server window, under Server, click Certificates.
On the Certificates page, in the Secure services using drop-down list, select Custom.
In the Service Certificates window, in the Certificate drop-down list, select your new SSL Certificate for each Service to which you want to assign it.
For example, in the Certificate drop-down list for Websites (Server Website – SSL) select your new SSL Certificate.
When you are finished, click OK.
Your SSL Certificate should now be installed and assigned to your respective Services.
Test Your Installation

If your website is publicly accessible, our DigiCert® SSL Installation Diagnostics Tool can help you diagnose common problems.
Mac Server For Mavericks Mac
Ready to Order Your Mac OS X Mavericks SSL Certificate
Buy NowLearn More
Comments are closed.