I need to open some of these pages to gather more details. I'll open the CSDN page, the baike.sogou.com page, the baike.com page, the "Version history" page, and the Bilibili page. CSDN page provides a download link for "o2mania 1.4.2 英文版". The baike.sogou.com page mentions that version 1.4.2 is a "圣诞版" (Christmas version) and that it's a continuation by "蜜蜂及樱花" (Bee and Sakura). The baike.com page clarifies that 1.4.2 is a fan-made continuation, not official, and lists its update contents. The "Version history" page also lists the update contents. The Bilibili page includes a Baidu Pan link that likely contains O2Mania and songs.
: It enables players to play .ojn and .ojm files—the standard O2Jam song formats—locally on their PC. Key Features of the 1.4.2 Version o2mania english 142 patched
O2Mania is an open-source client designed to play O2Jam files ( .ojn and .ojm ) without an internet connection. It is heavily utilized by competitive players to practice high-difficulty charts, adjust scroll speeds dynamically, and analyze hit timing. I need to open some of these pages to gather more details