Install error (GeoGebra)

[Douglas Summers]

[Flatpak 0.99.3, Mint 19 XFCE]

$ flatpak install flathub org.geogebra.GeoGebra
Installing in system:
org.geogebra.GeoGebra/x86_64/stable flathub b76cc44cf0c2
  permissions: ipc, network, x11, dri
  file access: home
Is this ok [y/n]: y
Installing: org.geogebra.GeoGebra/x86_64/stable from flathub
[####################] Downloading files: 1/1 136.6 MB (12.4
MB/s)          
error: Failed to install org.geogebra.GeoGebra/x86_64/stable: Wrong
size for extra data https://download.geogebra.org/installers/5.0/GeoGeb
ra-Linux-Portable-5-0-478-0.tar.bz2