The complete documentation of vym is available as PDF document in
english and spanish. It can be accessed directly from vym if a PDF
viewer is installed. It also can be downloaded from the vym site at
Sourceforge:

https://sourceforge.net/projects/vym/

Beginning with this version of vym (1.9.0) the versioning is similar to
that of the Linux Kernel:

Odd versions (like 1.9, 1.11, ...) are developer versions, the stable
"public" ones will have 1.10 or 1.12.