BL2 + TPS Modding Broken For The Time Being
Today (February 27, 2020), Gearbox patched both Borderlands 2 and The Pre-Sequel with some changes which adds support for upcoming cross-play between various PC-based platforms.
As a result of this patch, our current methods for hex-editing the games no longer work properly, so at the moment there is no way to run mods in BL2 and TPS. Rest assured that modders are looking into this, so hopefully we’ll have some news before too long, though there is no ETA for when it might be fixed.