pitool V270 is outdated.
and V284 was the last one, and the one with the latest FW for our headsets.
not sure why there is still the old one on that site, even the FW is 3 versions out of date.
and yea, i am using SteamVR 2.7.4(previous version) build and have no issues.
but yea, after going to that pitool, letting it update.
i deleted it and went back to picleint 1.35
here: Pitool 1.0.1.284v for the newest pitool at the time