when you load it it will have duplicate pixelmon, i added different versions, just open the modpack folder, and take out 2 pixelmon modpacks and put them in your desktop, then you can switch versions whenever you like.
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 (catus first modpack) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select catus first modpack from the list on the left. The launcher will handle everything else!