Install Gnome Platform/SDK

• flatpak remote-add --from gnome https://sdk.gnome.org/gnome.flatpakrepo
• flatpak install gnome org.gnome.Platform//3.20
• flatpak install gnome org.gnome.Sdk//3.20

Build the package

• Pay and download Simplify3D-3.1.1-linux-x64-installer.zip from the official site and put the zip together with the json file.
• flatpak-builder --repo=mys3drepo simp1 simplify3d.json

Add local repo

• flatpak --user remote-add --no-gpg-verify mys3drepo mys3drepo

Install the package

• flatpak --user install mys3drepo com.ucrobotics.Simplify3D

Update the package

• flatpak --user update com.ucrobotics.Simplify3D

Run the package

• flatpak run com.ucrobotics.Simplify3D

Note: you can also run it from the desktop launcher. We do provide a desktop file.