Aternos Modpack Not Up to Date - Pixelmon Generations

I have been trying to start a pixelmon server for my friends and I to play on, we like to use Pixelmon Generations through Technic launcher. We have been unable to join the server with the modpack installed because it says we are missing biomes o'plenty mod, I believe this is because technic launcher has pixelmon generations 8.3.0c which does not contain the Biomes o'Plenty mod, whereas aternos just uses pixelmon generations 8.3.0 which does still contain biomes o'plenty. I have already tried to go back to version 8.3.0 in technic launcher and it says it cant install biomes o'plenty, keeps telling me error. What can I do? Can I at the very least request that pixelmon generations modpack be updated in aternos by having the biomes o'plenty mod removed? Any help would be great, thanks!