If you have an alert on Windows when you try to install the new beta of Lychee slicer 3.5.3.

Windows Defender alerts you even if we have already validated the installer with a new certificate. It's a false positive.

You can bypass the alert box by clicking on "more info" then " Run anyway".

Sorry for the inconvenience, it will be sorted shortly, as soon as the Microsoft Windows Defender registry updates.