GitHub hosts the source code. It is not to download the program from. Not a
way to install it. The program can be compiled from source. Simpler, the
project site distributes DEB packages:
https://wire-app.wire.com/linux/debian/pool/main/wire_3.0.2816_i386.deb (for
a 32-bit system);
https://wire-app.wire.com/linux/debian/pool/main/wire_3.0.2816_amd64.deb (for
a 64-bit system).
With GDebi (in Trisquel's repository: install "gdebi" from the package
manager), you can then double-click on the .deb file to install it.
I will try Wire. Thank you dsj19.