Can't install in Mac Sierra 10.12.6

[wataru]

I can't install Synergy v2.0.4-stable in Mac Sierra 10.12.6.

When I open the dmg and double click the icon, I was requested the password for installing helper tool.

Then, type the password and enter the "install the helper".

The application will be down.

Why...?

[tyabuta]

I guess it's not the installing helper tool.
Try to the icon drop to application folder and double click  installed app.
 

[wataru]

Thank you !

When drop to application folder, I success to install.

not success if just only double click.