Bob, are you using the 32 bit or 64 bit Win 10? Note that you must match the version of Kontakt 5 Player to the OS, i.e. 32 or 64 bit.

Question #2 - Does Kontakt 5 player come with a 32 bit version? If yes and you are using the 64bit BiaB the 32 bit Kontakt player will not show up. Also if Kontakt is a VST3 BiaB will not see it.

As far as your 5 HDs, take one of them and put all of your VSTs on it. That would make your life a lot easier. Put all of the 32 bit VSTs in a folder like C:/Program Files (32)/VST, your 64 bit VSTi2s in C/Program Files/VST, and your VST3s in C/Program Files/Common Files/VST3. This works for me. YMMV

Note that you could use a wrapper to convert the the Kontakt 5 Player to either 32 to 64 bit or 64 to 32 bit but in the past I have found them to be problematic. With everything going to 64 bit wrappers are no longer needed.

Back in my day the only time we started panic buying was when the bartender shouted "last call"!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware