Hello,
this post is as much for my own sake in case I forget about it and run into the same issue installing this on a site in the future. I had the problem of Eurzone48, Int'l Datapost and Int'l Standard not working properly, when selecting them in step one of the checkout and hitting continue, one got returned to step one again.
After a bit of searching, I found this page
http://www.babygekko.com/html/downlo...3-zencart.html
which deals with this issue. It seems that the underscores in those files create a problem. Installing the new files (or modifying the old ones) didn't seem to work at first, but this was due to duplications of function calls and/or removed but not uninstalled modules. So I removed the module/language files, then cleared the duplications in the database - just search for for example international_datapost and internationaldatapost etc.
Make sure the modules are uninstalled first though, otherwise you'll also list the tables with installed modules and you don't want to delete those! As always when working with your database, backup backup backup!
I've yet to do a really extensive test, but things seem to work now.
karl
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