It's perfectly possible to get the two holy relics in the vent in the House of Pain, but impossible for me to get back out again. I've already taken a look at some youtube videos to see if there's something I'm doing wrong here. But no.
For me the vent simply just doesn't open far enough to get back out again. I can barely get in either for that matter. But at least I can force my way through then. I've tried getting it swinging a bit beforehand, but nothing works.
Anyone successfully retrieved the relics with the GOG version?