Based on available information, "Tantra KP Beta 15b1" appears to be a specific legacy version or "repack" of a private server client or mod for the classic MMORPG Tantra Online
Virtual Machine: Consider using a virtual machine for testing repacked or beta software. This can isolate any potential issues from your main system. tantra+kp+beta+15b1+download+repack+exclusive
Refined PvP Mechanics: Fixes for skill "fastcasting" and animation cancels to ensure competitive fairness. Based on available information, "Tantra KP Beta 15b1"