No, it's in the window BEFORE this one. The actual Save As window.
That depends if they were sRGB or Adobe RGB when they edited them. If they were sRGB, maybe they'll print ok, maybe they won't. If they were Adobe RGB, they DEFINITELY won't.
The second troubleshooter is for the already-edited files: https://www.damiensymonds.net/art_tscs2.html
That's really really really bad. Where are you seeing that?
This has been saved at REALLY low quality. Can you see all the faint squares in the detail? That means really aggressive jpeg compression. Are those squares in your print file, or did you merely accidentally save this 100% crop at low quality?
Oh, phew!!
Ooh, how often do you use WHCC?
Not in the slightest. I've been using it for years, and it's never interfered with anything. Did you see the class I wrote about Glary?
Yes, I still think this might be a good idea.
The way I figure it, you should have two PSDs, that's all. One is the main master one with all of those 62 layers you mentioned. Then you merge the layers that you don't want people to access, and save a "for clients" PSD.