thanks @Hiromitsu
so to be clear, you’re saying you needed to do the following to get eigenD to start?
(the the standard application link in /Applications would not work?)
Im a little surprised that this is the case… but will investigate.
Ive been waiting on the release (which I believe is on Friday? ) , I guess I’ll update my iMac then.
though, there do seem to have been quite a large number of manufactures/developers saying they are ‘not ready’ which is a bit concerning.
(i’ve not checked my hardware/software stack, to see if there are any known problems yet 
)
my guess is once 10.15 is released, we may have a number of eigenharp owners turning up for help on installing the 64 bit version - so Id be grateful for anyones suggestions/comments on the current release notes e.g. if Ive forgotten to mention anything 
EDIT: given Catalinas imminent release, Ive created a post on the installation process, so the information is in one place - mainly it’s pulled from the 2.1.7c release notes.
(Ive renamed this thread, to help differentiate them)
Id gratefully receive any feedback on it,
I’ll obviously update if any other information/tips crop up as people upgrade.
one ‘small issue’ is its hard for me to do a ‘fresh’ install, since I’ve obviously upgraded to 64 bit on all my macs already… so what I will encounter is issues related to a 10.14 mac with EigenD 64 bit going to 10.15. - so any experiences outside that would be good to hear.