Thanks Andrew, Callie and Noel for your suggestions. I had to dig a little deeper prior to coming back to this thread. As it turns out, when I investigated further, when looking at the "What Add-ons do I have, 19 RTs were listed as not found. However, using Style Picker, It initially listed 150 RTs not found. I was missing all of some RT sets, missing 1 or more of other RT Sets. From my lists, only sets with dates 2017/11 and 2016/11 are involved. My purchase of both BBW 2017 and 2016 was the "Everything Pak."

I had also previously installed when they became available: RT patches Feb 2017, March 2017, Jul 2017, Nov 2016, Dec 2015 and all BBW updates for all versions. In conjunction with my previous post,I ran the BBW 2018 Download/Installer Manager. It listed everything but RealTracks Sets 294-300 as installed, so I executed the download/install form within D/I Manager for RTs 294-300. Afterwards I executed the detailed styles rebuild, and subsequently the quick rebuild but with no improvement. I executed the install once again from within D/I Manager, but no improvement. I had just prior to the above executed the Cleanup utility. All of my RTs were/are in bb\RealTracks, as were/are RealDrums, Styles, etc. Style Picker shows 5760 items in list with no filters. With RTs not found filter set, 5611 items are listed. The log for cleanup did show some errors in folder relocation, but most of those had to do with other add-ons (e.g., Swingin' Jazz Piano Solos, etc.). There is however, perhaps an issue with the last few lines in the log file:

Files with STY extension are absent in folder C:\bb\
Files with STX extension are absent in folder C:\bb\

So not sure what the problem is with all the missing RTs, and I'm not looking forward to the download times for the RT Sets involved, especially since some of the sets only have one or a few missing.

The involved RT Sets and number missing out of total listed in parentheses (e.g., 2 of 18)are: 255(4 of 4), 256(8 of 8),257(3 of 3),258(4 of 4),259(6 of 7), 260(4 of 4),261(4 of 4),263(3 of 13),264(6 of 6),265(6 of 6),266(3 of 9),267(12 of 12), 268(6 of 6),269(8 of 8),270(4 of 4),271(4 of 4),272(4 of 4),274(5 of 8),277( 3 of 11),278(1 of 8),279(3 of 9),281(2 of 28),283(2 of 28), 285(5 of 36),286(1 of 18),288(5 of 21),289(1 of 29),290(6 of 36),BonusPak(4 of 25),Bonus(10 of 54),Misc.(2 of 329),MST23(2 of 6),MST24(2 of 5),MST26(1 of 4),MST27(2 of 11).

Sorry about the eye watering list above, but I didm't see a way to include a text attachment with the post.

Richard