Sorry - I didn't get why do You need really old PB2.5? It's because of mEAn? It doesn't support CS1.5? I have to ask botmeister about it. If it does support CS1.5 - the latest version of it should support podbot mm. You have to know in podbot mm are fixed all bugs You may experience in PB2.5 . I mean no crash with pb mm when someone kills a hostage, fixed aiming bug due some Botman's bug in old bots templates (some axis works reverted and Botman didn't know it that time - it wasn't really his mistake and a lot of more). Also there are some new features in podbot mm they weren't implemented in PB 2.5 .
