Could you please let us know which revision of AN68272 document you refer?
The Application Note "AN68272" (Document No. 001-68272 Rev. *O) located in http://www.cypress.com/documentation/application-notes/an68272-psoc-3-psoc-4-psoc-5lp-and-psoc-analog-coprocessor-uart doesn't have any description of UARTBootloaderHost.exe.
If you would like to do bootloading an application from PC Host, you can use PSoC Creater 4.2. Please refer to the section 2.4 Bootloading Using a PC Host in Application Note "AN68272" (Document No. 001-68272 Rev. *O).