I worked at it for a couple of hours this afternoon, and finally got the three .OCX files loaded (MSCOMCTL.OCX was the one I tried first, so it was the one I listed here). It seems that my laptop didn't realize it was a 64-bit system (ARM64-based, 64-bit OS), and kept reverting back to 32-bit, so whatever I tried installing as 64-bit wouldn't take.

A week or so ago, when I inadvertently loaded a virus/Trojan/whatever onto the laptop, it had changed my system around so that when I tried to re-install Chrome on it, it would always install the 32-bit version. Took me awhile to defeat that, and get the 64-bit version installed. Today, I finally realized that somehow SysWOW64 (needed for the .OCX files, and for .dll registration, also) had also been removed, so I put it back in. Everything followed the installation sequence after that.

So, I've now got multiple copies of desktop shortcuts, zip files in various locations (from three different base sousrces), and various other duplicate files that I'll need to carefully remove from the laptop; but it seems that all the BMW Standard Tools are now installed, only needing the X5 connected to complete installation (I'd only been able to get INPA running previously).

Thanks for links, encouragement, and other help, guys, it's really appreciated!

__________________
01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide