This is the closest to Popularmmos' Epic Proportions Season 8/CustomModChallenge as I could make.
ATTENTION: BECAUSE OF LIMITED BANDWIDTH ON DROPBOX THERE CAN ONLY BE AROUND 30 DOWNLOADS PER DAY
"According to Dropbox support, public links for free accounts may not use more than 10GB of bandwidth per day while that limit is 250GB per day for paid Dropbox accounts. The links are automatically suspended if any of your files exceed that limit."
REPORT ANY BUGS/REQUESTS TO THE DISCUSSION
I'm not sure if this works but if you can't download the modpack or update it try downloading it from this link and put the folders in. If you are updating it you can open the modpack folder and delete the configs, chocolate, and mods folders and replace them with the new ones. If you don't have the modpack go to your .minecraft folder and replace configs, chocolate, and the mods folder. Make sure you install Optifine in the mods folder and install the lastest version of forge 1.6.4.
https://www.mediafire.com/file/km4es0jijslw6nq/season8.zip/file
Mod List:
LionKing, DamageIndicators, MB-BattleGear, Blokkit, AnimalBikes, Animated-Players, AnimationAPI, AntiPlantVirus, Archimedes Ships, Armor Bar, BabyAnimalSwapper, Backpack, Backtools, BatterTowers, BetterDungeons, Better Furnances, BiblioCraft, BuffBar, CakeIsALie, ChickenChunks, CodeChickenCore, ConfigMod, CoroAI, CustomNpcs, DecoCraft, DoomLikeDungeons, DungeonPack, DynamicLights, EnchantingPlus, EternalFrost, ExtendedRenders, Familiars_API, Familiars_DefaultMobPack, Familiars_ExtendedFamPack, Familiars_HerobrineFamPack, MobAmputation, Gizmos, Godzilla, GolemWorld, GravityGun, GrimCore, HardCoreEnderExpansion, Hats, Idfixminus, InfernalMobs, Iron Chests, Instant massive Structures, KingdomOfTheOverworld, LegendaryBeasts, LomLib, LuckyBlock,, LumySkinPack, Magitek Mechs, MalisisCore, MalisisDoors, ModBuild, Modular Pots, More-Enchants, Morph, MutantCreatures, NotEnoughItems, Optifine, Orespawn, Pokeball, PowerTools, RivelRebels, RottenFleashToLeather, Ruins, Secret Agent, SmallBoat, SpecialArmor, SuperherosUnlimited, Telepads, Torched, TrollStuff, TwilightForest, UpdateChecker, IChunUtil, VillagerMincer, Weather, ZansMiniMap
Missing Mods From Original That I Couldn't Get To Work:
Jond311Ninja, VendingMachines, Mr Crayfish Furniture, Dragon Mounts, bspkrsCore, Treecapitator, School, Sun's Son(Working on Right Now)
Mods I Added That Arn't From The Original:
B0bGary's Biome Remover, HatStand, Idfixminus, LegacyJavaFixer,
If you want to use the older version of Superheros Unlimited(2.3.3) you can download it here, http://www.mediafire.com/file/99jpdbox91uuykj/Superheroes_Unlimited_Mod_V2.3.3%25281%2529.zip/file. After you download it you have to go to Technic Launcher and go to the modpack and click on modpack options. When you open it click on open, then go to the mods folder and replace the Superheros Unlimited file with the new one.