If you want to ensure that everything works fine when connecting to the server, make sure to completely delete the modpack instead of updating it.
Install HMFM
Step 1
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.
Step 2
Type in the modpack name (HMFM) or paste the following url into the search box.
Step 3
Finally, click Install at the bottom right of the launcher after you select HMFM from the list on the left. The launcher will handle everything else!