Installing the update using XenCenter

Download the update to a known location on a computer that has XenCenter installed.

In XenCenter, on the Tools menu, select Install Update. This displays the Install Update wizard.
Click Next to start the wizard.
Click Add to upload a new update.
Browse to the location where you downloaded the Service Pack, select it, and then click Open.
From the list of updates select XS65ESP1.xsupdate and then click Next.
Select the hosts you wish to apply the Service Pack to, and then click Next.
The Install Update wizard performs a number of update prechecks to verify that the update can be applied on the selected servers and displays the result. Follow the on-screen recommendations to resolve any update prechecks that have failed. If you want XenCenter to automatically resolve all failed prechecks, click Resolve All and click Next.
Choose the Update Mode. Review the information displayed on the screen and select an appropriate mode and then click Install update.
Note: If you click Cancel at this stage, the Install Update wizard reverts the changes and removes the update file from the host.

Click Install update to proceed with the installation. The Install Update wizard shows the progress of the update, displaying the major operations that XenCenter performs while updating each host in the pool
When the update has been applied, click Finish to close the wizard.
If you chose to carry out the post-update tasks, do so now.