having the same issue here with the pasted url http://www.technicpack.net/api/modpack/mcnarion-modpack (should it be mcnation, like the actual name?) giving an error message that reads "Invalid Technic Platform delivery URL."
I just loaded the Technic Launcher this evening (U.S. -6:00 GMT), and wanted to add the TEKKIT mod. If anyone has a solution, I would sure appreciate some dialect. I have read through all the trouble shooting that worked for some of you but I have had no luck so far. I even tried to edit the URL to read mcation just in case; no go.
Thanks for reading and hopefully someone could give me a solution.
Regards, Guad