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The installer doesn't work because you compiled it with an outdated version of openssl.
Half the point of appimages is that it contains all you need to run the app.
That is a valid question. We are working on this.
For now, how can we solve? I can't use the Installer on Windows because of this issue, and I can't use it on Linux because of this one.
Don't use Windows 8 or use Live CD of Ubuntu 18.04.