No windows installer currently - just place the extracted folder contents somewhere out of the way, and then pin the exe to the start menu / create a desktop shortcut.

Opening the .app will give a security warning; you can bypass it by right clicking the app, and then click open - this will give a 3rd option on the security warning to open it. If still having trouble, read this.

Requires you to install Adobe AIR first, but may allow installing the app on Linux or on other desktops if having issues with links above.

Some older devices may have issues saving an image - share links do work however.