Citrix XenApp/XenDesktop 7.13 Upgrade Director

Citrix XenApp and XenDesktop can be upgraded, but must be done in a particular order to avoid downtime.

Prepare - run site checks, backup databases, check Subscription Advantage date, close apps and console and check permissions.
Upgrade License server
Upgrade StoreFront
Upgrade Director
Upgrade Provisioning Services servers and Target Device software
Upgrade half the Delivery Controllers
Upgrade Studio
Upgrade XenApp/XenDesktop databases
Upgrade remaining Delivery Controllers
Upgrade Virtual Delivery Agents (VDA)
Update machine catalog and delivery groups

The following article goes through the steps of upgrading the Citrix Director component. It is a very straight forward process; all Director servers should be upgraded for compatibility reasons.

Insert the XenApp/XenDesktop 7.13 installation media and click on Upgrade Studio and Server Components.

Select I have read, understand and accept the terms of the license agreement and click Next.

Makes sure you have followed all the above steps before continuing. Once everything is in place select I'm ready to continue and click Next.

Add one of the Delivery Controllers in to Controller address and click Test connection.

Click Add.

Click Next.

Leave Automatically selected to allow the upgrade to set the Windows Firewall rules or if using group policy select Manually and click Next.