Sorry for lack of updates Traincraft is getting a full rewrite so it will be a while until the 1.7.10 version come out.
Installing a modpack using the Technic Launcher is easy. If you don't already have the launcher downloaded, visit our download page to get the latest version.
Type in the modpack name (Ride The Rails) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select Ride The Rails from the list on the left. The launcher will handle everything else!