The latest version of HOTPin is available as follows:
Update to HOTPin Server Appliance (HSA) version 3.1
Standalone software version installable on Windows Server 2008 R2 systems
What's New?
Synchronize user accounts with Microsoft's Active Directory.
Dashboard displays information about recent HOTPin events and user authentications.
Support for external token keys (hardware OATH compliant, HOTP based).
Support for provisioning keys through QR codes with mobile devices.
Known Issues
In some cases, installation via an RDP session may adversely affect HOTPin server functionality. If RDP is necessary, log in with the local administrator account.
Key Things You Need to Know
The update for 3.1 to 3.5 is available via the appliance web UI's Software Update feature and is silently installed. This update will install over the existing HOTPin installation and requires a reboot.
System Requirements for Standalone Software Installation