I have ran my sr5 group through Silver Angel, Mercurial, Bottled Demon, Dragon Hunt, a few of the Harlequin scenarios.. ultimately, I do most conversions on the fly. Attributes I tend to leave more or less the same, as with skills. I'll add skills that didn't exist in sr1, and split Quickness/Intelligence into the sr5 attributes.. Use the modern equivalent to any gear/spells mentioned.
As for the Matrix hosts, those I typically just try to go with what makes sense, comparing it with the host difficulty chart. Some of what might have been "difficult" back in SR1 might make sense to only be a rating 3 or 4 Host now days. Just play it by ear.. Once you actually start doing it, it's a lot easier than one might think to just run these for SR5 right out of the book, on the fly.