If i was in your shoes & i wanted ip5 to show again here's how i'd do it assuming that i hadn't already archived it before things turned to custard,if you have archived it,uninstall ip & use restore archive to install ip5,there's no reason for it not to show up in impulse so long as you used impulse to do the work
i have drive images created before doing anything in registry or any experimentation so with that said
uninstall ip
reboot to safe mode
delete ip folder inside prog files-most probably doesn't make a diff but i do it anyway
use regedit to delete entries for ip = HKEY LOCAL MACHINE & CURRENT USER-software-stardock-objectesktop
reboot to GUI & run ccleaner
start impulse
chances are ip free & ip 4 will show,after installing ip4 while ignoring the ip free & restarting impulse or doing a full reboot, ip5 with any luck will appear in impulse as it would've detected ip4 as installed,run the download & archive for ip5 if it's available,personally i'd then uninstall ip4 & then run restore archive to get ip5 up & hopefuly it will appear as installed in impulse, then again maybe not & you could be up the creek without a boat & a paddle
Don't know if it makes a diff or not perhaps using ccleaner to clear out the caches as well as temp files may help als,other than that maybe someone else has a solution for you to get ip5 back