This is a new and improved official version of the Nucleus Co-op application and is part of the SplitScreen.Me Github organization.
This new version is based off of the Nucleus Co-op Alpha 8 Mod build and features a ton of enhancements.

Note: Some Nucleus Co-op hook dlls and Goldberg emulator, used by Nucleus, can sometimes be detected as potential treats by Microsoft Defender and other anti-viruses or web browsers: this is 100% a false positive see here and here. You may have to allow Nucleus Co-op as an exception before extracting.

📚 Prerequisites

• .NET Framework 4.7.2 or higher: Microsoft direct download link.

• Microsoft Visual C++ 2015-2019 Redistributable (both x86 and x64): Microsoft direct download x86, Microsoft direct download x64.

• Microsoft Edge WebView2 (Only if the downloader gets stuck on loading screen): Microsoft Edge WebView2.

💻 Installation

• Installation Guide

• FAQ

• Download The Installer

• Download The Zip Archive (password : nucleus)

👥 Social

• Official website.
• Subscribe to the official Nucleus Co-op subreddit.
• Join the official Nucleus Co-op Discord server.
• Join the official Nucleus Co-op Patreon.

📝 Changelog for this release

• Added new options to Game.ProtoInput.SetWindowPosHook = true;: Values: true, Nucleus.SetWindowPosHook.DontResize, Nucleus.SetWindowPosHook.DontReposition.
• Added new hook Game.ProtoInput.MoveWindowHook = true; which some games use it to set the size and the position of the window instead of SetWindowPos. Values: true, Nucleus.MoveWindowHook.DontResize, Nucleus.MoveWindowHook.DontReposition.
• Added new hook Game.ProtoInput.AdjustWindowRectHook = true; adjusts the window before being created.
• Added new hook Game.ProtoInput.SetRemoveBorderHook = true; Values: true: removes the border whenever it finds it and maintains the window aspect, Nucleus.SetRemoveBorderHook.DontWait: to force the hook even if the window is borderless.
• Added new option Game.ProtoInput.SendMouseDblClkMessages = true; to enable double click messages.
• Added new option Game.ProtoInput.PutMouseInsideWindow = true; which is a workaround fix for scrolling the window edge. Values: true, Nucleus.PutMouseInsideWindow.IgnoreTopLeft, Nucleus.PutMouseInsideWindow.IgnoreBottomRight.
• Added new option to Game.ProtoInput.DrawFakeCursor = true; Values: true is the default option, Nucleus.DrawFakeCursor.Fix: to apply the new draw logic.

Kudos to SAM1430B & Messenils for these new additions.