hello all... thanks for the wonderful software!
I am having this same problem on trying to install updates via the web interface:
Installation instructions not found: /home/admispconfig/ispconfig/temp/eedd44476fd5dde8fb7003b509ae2cae/package.ins
I didn't unpack the pkg file, and I've been using packages downloaded from the site.. and everything else in my installation was completely straightforward and fine. The only non-standard thing is that I'm on a 64bit debian install... but I can't see how that would be a problem..