The modpack, Steve's New Galaxy is available on both CurseForge and Technic Launcher
CurseForge: https://www.curseforge.com/minecraft/modpacks/steves-new-galaxy
Technic Launcher: https://www.technicpack.net/modpack/steves-new-galaxy.1781509
Make sure to allocate at least 4 or 5 GB of RAM to the modpack before launching!
Good Luck, may the odds be with you.