Sorry I missed your post. I'm usually sent an email to let me know when someone posts on here but this time I didn't get one and I get so few replies that I tend to forget to come back, especially when I'm preoccupied like I am now with a new pack that I'm working on..
Anyway to answer your question, I've just loaded my Technic Launcher, deleted my existing pack and clicked on the instal button and it had no trouble installing it, so its still there.
I also tried installing the pack from the technic site and it said I needed to instal the launcher first. Not sure what else I can tell you other than to try installing it again and to make sure you're doing it from the Technic Launcher.
I'm assuming of course that you are trying to instal my old Shanghaied version and not the newer Shanghaied Nightmare which can only be obtained from Curse.
Hope you have better luck with your next attempt.