Pedric: This problem is fixed!
You can download patch 1.4 from The Witcher site. It will upgrade the vanilla Witcher to EE. It will not require registration. You will need the language pack, which you can get to on the same page as patch 1.4. Then you may as well patch to 1.5.
Thank you CDPR!
Woohooo!
Just tried this...and installing w/ Patch 1.4 from Witcher's site.
It's installing Patch 1.4 w/out it looking for server-side auth or registration or anything.
I used the language packs I already had, as well.
PROBLEM SOLVED.
EDIT:
Patch 1.5 installed from off the Witcher site, as well.
Game is running fine here on my modern Win 7 PC now.
AGAIN - PROBLEM SOLVED.