I hope she didn't disappear in a puff of smoke when she hit the ground.

"No significant scratches" seems a somewhat less than accurate description. I can see plenty of very significant scratches in the images.

RawShooterEssentials (RSE) is now very old and has been replaced by Adobe's Lightroom product. Adobe bought Pixmantec, the authors of RSE. No further development of RSE has happened in the last several years.

PhaseOne's CaptureOne is very good too and somebody on here might have a spare licence key from a Sandisk memory card kicking around. It was given away free with Sandisk's cards at one time.

I'm surprised anything works on 64 bit Vista.

You are not really missing much by not having the software. I don't think that there are many here that use the Pentax supplied software.

An alternative would be to use an older TTL flash that has a tiltable head (AF400FTZ, AF500FTZ or similar) mounted on the hot shoe and pointed at the ceiling. If set to manual and low output, it would trigger the slaves with no pre-flash whilst contributing very little light to the scene. This assumes you have a ceiling to bounce from.

Radio triggers are cheap and my preferred option. If you buy the Phottix ones, make sure you get the MK-II versions where the receiver has a PC synch socket to wire your Bowens lights into. The ones I have (Original MK-I) don't have the synch socket.

Dust visible in the viewfinder is, at worst, annoying. It will not affect your images in the slightest.

An Arctic Butterfly from Visible Dust will sort your sensor dust issues.

Yes, I was the proud owner of that rarity. It's a great lens but I just wasn't using it enough to warrant keeping it. I replaced it with a DA*60-250 and a SMCP 500mm 1:4.5.

How can that be? Perhaps your dioptre is not adjusted correctly?

My understanding is that back/front focussing only affects AF lenses and AF focussing. Any lens focussed manually should reproduce what you see in the viewfinder unless the mechanical position of the mirror relative to the sensor is not accurate.

Most of us use fast lenses, like the FA 50mm 1:1.4.

In low light, use a torch.