I have tried to connect with a friend through LAN but when she joins it kicked her out saying checksum failed you may need to install. Both have the technic launcher and have the same java version that are jre 1.8.0 _ 101 and all firewalls and allowing connection. The logs has no java error and I reinstall both packs twice so what's the problem
I got a crazy idea. because of the fact that I used a modified version of my mod pack and it may have used the same minecraft.jar for reinstallation. I might try to update the mod pack and delete minecraft.jar nd have a fresh reinall and I hope that fixes that. I heard that they might have bckported older minecraft versions to add that blacklist to the game.