Originally Posted by an0ther
Problem is with cwm as viper has aroma installer. You need twrp. I just tried to download from official site and it worked fine for me.
Sent from my HTC One_M8 using XDA Premium 4 mobile app
Though so it could be recovery problem, but two points in mind:
1. The link from where I got the CWM recovery, showed a video tutorial wherein he got installed Viper One 1.6.0 through CWM ... I'm having S-On but I don't think that could be an issue for installing ROM or particular with the issue that I'm facing. So most probably it has to do with Recovery.
2. Trying to download TWRP 220.127.116.11 or even with TWRP 18.104.22.168 I'm facing with the similar issue, the download comes and halts at 99.99% can't get through ahead of this. So please if someone can just post ME a latest TWRP img on drive for download it would be really nice & helpful.