I got this to work via my Linksys Print Server to my HP Deskjet 460. Used the Linksys PS's (static) IP address assigned on my home network.

Also I (just now) emailed Westtek per below:
re: Upgrades are complimentary to ROM or Registered Users of ClearVue v5.x and JETCET PRINT v4.2, v5.x

and Please contact support@westtek.com for assistance in gaining your complimentary upgrade.

I have the OEM v5.0.904.13 on my Touch Pro Pocket PC. How do I go about upgrading to v5.2.1021?

Edit, Reply from Westtek:
Click on the appropriate 'Free 15-Day Trial' link and select 'Run' to download version 5.2. NOTE: JETCET PRINT v5.2.1021 will install over JETCET PRINT v5.x deactivating the trial automatically after installation process is complete.