Yougi, Delete of Dump folder has helped, it worked somehow, thank you.
Btw, i tried on my brother's pc, he has windows xp home edition and the same files that i have there and on his system - the new monsters as Oxide said - are visible and got few times crashes, but ran well btw... I think his Dump folder is different or what and doesnt depend on which operation system is running the game, so, yea.
Thanks for your fast answers, now im downloading the latest post's full client (1,2 Gbyte) that uploaded by KingLi and posted on 24th december.
Im sure it will be fine with both help of yours.
edit: delete of dump folder helped only for not to get dc, but at fighting with mobs still gives me dc. doesnt matter, at least i can leave the cave until I download the new client