How can I install MyPaint with Appimage in openSUSE Tumbleweed?

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Hello Community!
I want to install the latest version of MyPaint on this pc with openSUSE Tumbleweed.
At this moment I’m using the version 1.1.0, installed with “sudo zypper install mypaint”, but I’ve noticed that the version on the other my pc (Xubuntu 16.04 LTS) is the 1.2.0git and this version is more complete than the openSUSE Tumbleweed version. So I’m asking to someone how install MyPaint on this openSUSE Tumbleweed pc. I’ve tried to install with Faltpak but the installation failed (GPG error). Many thanks for reading. Regards.