Q:The modpack crashes after about X minutes, what's wrong?
A:Make sure your launcher has more RAM dedicated to it, if you are running a Windows 32-bit OS, make sure you have Java 32-bit installed, as 32 bit systems cannot go over 3 GB
Type in the modpack name (Pixelmon (3.5.1 - 5.0.3)) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select Pixelmon (3.5.1 - 5.0.3) from the list on the left. The launcher will handle everything else!