Let's just be clear right away, 1.19.1 does not work with RL 1.19.0. I will try to adapt RL to 1.19.1 as it's now standard (and sorry if you don't like Windlight, it seems to be standard now as well, thanks LL), but it may take time, please be patient and don't ask me questions about when I'll release it, it will be done when it's done. LL has the habit of releasing things and making the old viewers obsolete or at least unavailable without prior warning.
It is done, you can find the latest RestrainedLife viewer 1.10.5 for Windows here (this is the 3rd attempt, this time you'll get a lot more files that you need to copy as well) :
I have not asked Orchid from eRestraint to put it on her site yet, as it's still experimental and I have spotted two bugs already. I'll work on it later, since I want to get back to work on the Banishment Program. Have fun with this update already !