because I wanted to resolve the first one, I tried adding Mystcraft the most updated 1.2.5 version that can still be downloaded, from the author's blog, to Retro SSP FTB I tried putting it in the mod folder, it appears there but doesn't install tried both ways of adding it to the jar via the launcher and doing it manually but each time I start that modpack the zipped file itself... vanished. So I went to the support site, registered, and I never got my email. Looked for an option to resend, did not see one. Those are my two problems any help that leads to fixing either problem would be greatly appreciated. Thank you for your time. Oh and the version in question is Mystcraft v 0.8.6b for Forge 3.3.7.135 I assumed it would have some compatibility with the version of Forge Retro uses. Also... Minecraft itself launches without any problems, aside from Mystcraft vanishing.