Hey just a PSA for those using Technic: You need to reinstall the pack because the old one got deleted. You can either go here:
http://www.technicpack.net/modpack/fluxgalaxy.560255/
or you can search for FluxGalaxy in the Technic Launcher (in the Modpacks tab).
Your worlds are located in the ".technic/modpacks/
flux-galaxy/saves/" folder. Move them to the ".technic/modpacks/
fluxgalaxy/saves/" folder after you have installed the new pack.
If you don't want to re-download everything just rename the "
flux-galaxy" folder to "
fluxgalaxy" (these are located in /.technic/modpacks). After changing the folder just install the new pack and it will launch the new pack without downloading all the mods again and you will also have your worlds available.