ruu for htc desire 816 all model

since users of HTC desire 816 are facing many problems after the Lollipop updates like faster draining of battery low internal memory etc.
users who rooted there phone and installed custom ROMs are also not happy and want to return back to the Stock .
but they face problem when they install the latest update from HTC they are not able to download it .

I request all the developer community please provide links to them.