Don't know why your getting so pissy?
Also the error you're describing is a little illogical... If I delete .htaccess with WP in a folder off root, all that happens is my URLs break. I can still see the front page, log in, etc etc. As soon as I resave permalinks, it comes back.
If my .htaccess is deleted, or modified; then my web site does break.
The .htaccess file was modified by the installer on Friday. The file date was changed by it. I'm sure that none of my plugins did it. The site was working prior to the attempted update.
- It's now working again. For my part, this response is irrelevant.
I'm using standard plugins, and I have them installed on all my sites.
All in one Favicon
Conditional CAPTCHA for WordPress.
Custom Meta Widget.
Google Calendar Events.
Hupso Share Buttons for Twitter, Facebook & Google+
Weaver II Theme Extras.
WP Multibyte Patch.
Select WP Updates Notifier.
WP User Avatar.
As I say, I've got it all working again. I hope you can make use of this information, and do find a link between them; and the installer.
Your attitude over this, is beginning to take on tones of hysteria.
For my part, I will now cease all communications with you over the matter, and have [de-ticked] the follow up link on this post.