[tinkerman]

I just realized that the ISTA-P Loader 6.1 folder from the following thread:
"ISTA-P Loaders 6.1 to 6.6"
https://cartechnology.co.uk/showthread.php?tid=63902

includes the file "Einstellung bei Loader V6.1F.de" which has instructions(in German) for enabling 6.1(with support for K+DCAN/ENET) to "work"* with more recent ISTA-P (e.g. 3.72 confirmed with this standalone version).

Translated:
1. Open the ISTA-P installation folder and locate the “application.xml” file and
open it with the editor. (e.g. notepad)

2. Change the value “distributionVersion="xx.x.xxx" to the value “distributionVersion=“3.xx.x.xxx“
So just expand the beginning of the version with 3.
Don't enter xx.x.xxx there!! Only at the beginning 3. (Save file)!!
!!Everything else stays as it is!!

* The Loader 6.1 notifies during initial boot that EDIABAS 7.3.0 needs to be installed. So I installed my "patched EDIABAS 7.3.0" then rebooted Loader 6.1, selected K+DCAN, selected "BMW cars", then ISTA-P 3.72 started booting and eventually I was able to confirm K+DCAN/"ICOM" connection in ISTA-P!

But it would be reassuring to have a more recent version Loader with the K+DCAN support as I'm not sure how reliable the 6.1 would be with more recent versions of ISTA-P. I hope beemerboy will come through at some point...

Cheers...