In Java Options, ensure that “Minecraft Java Version” references the 64-bit Java. (typically will say “Default (version number 64-Bit)” or “Latest (version number 64-Bit)”.
Next you need to change your “Memory level. This is a trial and error step here. Technic seems to run best for most people between 5 and 8 GB of RAM assigned but your setting will also depend on how much RAM your system has as you need to leave at least 1.5 GB for your Operating System.
Once your Java settings are done, it’s time to install the modpack(s). On the top of the Technic Launcher, click the tab labeled “MODPACKS”. Once on the MODPACKS tab, click the search bar in the upper left and enter the name of the modpack "Adultcraft Foundations". Once you click the modpack name, there should be an option to install it.
Once modpack is installed, it is recommended to close and reopen the launcher to ensure java settings and such are updated. Once reopened, click Play to start the game.
After installation is complete, click Play Online to enter the server.
PLEASE NOTE, when starting the game and when connecting to the server, especially the first time, it may take a few minutes to load everything in and for your game to catch up. This is normal as we have a lot of mods in our pack and it is a lot of information for your game client to process and render for you. Some users may experience a crash on their first load of the server. If this happens, don’t give up. Try connecting again. If you have repeated issues with crashing while loading the game, please feel free post a message on the forum asking for assistance and we will be happy to do whatever we can to help.