Thank you for installing GNU Octave!
Octave 4.4 is a major release with many improvements in Matlab compatibility as well as significant cleanup of the core C++ code.
A full list of changes can be found in the Release Notes from the News menu.
During the installation a default BLAS library was selected. The installer contains two BLAS implementations, the NetLib reference BLAS and OpenBLAS.
The choice of library may be changed after installation by copying either librefblas.dll or libopenblas.dll to the file libblas.dll in the bin folder of the Octave installation.
A number of Octave-Forge packages have been included with Octave, however they must be loaded in order to use them.
Other packages are available from Octave-Forge.