Major Issues on all Platforms on 1.19.x releases

[jstefanop]

• **Etcher version: All recent 1.19.x releases
• **Operating system and architecture:All systems
• **Image flashed: .img.xz files
• **What do you think should have happened:Proper flash and verification
• **What happened: Mac imaging fails with write process issue on .xz images, linux cant even load image into etcher

You guys need to revert your public downloads to v 1.18.11 which is the last stable version. Recent release does not work for most images on almost all platform, we are directing all our users to revert to 1.18.11