Read the instructions on his site. They are very clear. First Full Stand-Alone Installer for PowerSDR ke9ns v126.96.36.199 (you do not need v2.7.2) Contains: All files and programs needed for a fresh install. Firmware updates to the Flex-1500, 3000, and 5000 radios for band region updates v.2.8.0 will automatically copy over the full contents of the 2.7.2 database folder and QuickAudio files.
(Note: v2.8.0 will not affect operation of v2.7.2 software)
Download: Incremental Installer for PowerSDR ke9ns v188.8.131.52 NOTE: Always do a Setup->Export Database before updating Contains: Just updates made after v2.8.0 and includes updates to DXLOC country listing, and SWL listings. So if you have already installed the FULL (Orange) Installer, then from now on, you only need to update here (Green) Installer.