You can download Unified Service Desk 2.2.1.806 Version Package Deployer and Executables from the below links,
| Name | Size | Download Link | Description |
| Dynamics365-USD-2.2.0.755-PackageDeployer.exe | 82.8 MB | Click here | USD Package Deployer to install solution components in CRM |
| Dynamics365-USD-2.2.1.806-amd64.exe | 88.7 MB | Click here | 64 bit USD client |
| Dynamics365-USD-2.2.1.806-i386.exe | 88.7 MB | Click here | 32 bit USD Client |
Arun Potti's MS CRM blog 