ok, here's the result of testing:

what works: the old render2texture.dll with the bugs, after copying the two dx9 files

the problems: it stretches the screen vertically, and it looks really bad
the new render2texture.dll (1.1) doesn't work at all, even with the dlls, it won't load at all
only bright entities or entities that have bright materials are visible
any clipping or fog code messes up the rendering process

i have 6.60 com, and the pc i have supports the required functions