The reason why the Mac beta version did not start was due to the Mac OS function that makes it impossible to run apps downloaded from the Internet for security reasons.
This feature is very strict, costly to solve, and due to various factors, we have decided not to officially support macOS at now.
However, some users want the Mac version, so we will publish it as a beta app unofficially and without guarantee of operation. It requires special operation and trust in the app to start.
The method is described in the readme, but you can type the following command in the terminal.
xattr -cr ~ / Downloads / LovelyComposer_1.2.4_Mac_Beta /