I don't know the exact version number, but the versions of SecurityCraft that do work with that Forge version are very old. There should be no reason for you to still use that Forge version. If a mod does not work with newer ones, either find an update for it, or don't use the mod. Alternatively, don't use the mods that don't work with 2759.
Additionally, this is an issue tracker for bug reports, not for general inquiries. If you need help with something or have a question, please join our Discord server and ask in the help channel.