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As economists, we will be using Octave as a free alternative to MATLAB in order to run Dynare. Dynamic macroeconomic models, in particular Dynamic Stochastic General Equilibrium (DSGE) models, are commonly solved using Dynare, a free software package designed for this purpose, with the particularity that it requires either MATLAB or Octave to operate.
Many universities provide free MATLAB licenses to their students; professionals and enthusiasts, however, will need to purchase one (or resort to an illegal download, which I strongly discourage). Octave is a free alternative, but be aware that its latest release is not compatible with the current version of Dynare, which requires Octave 11.1.0 specifically.
Below you will find the download link.
The Octave homepage always serves the newest release — currently 11.3.0 — but Dynare's Windows installer is compiled against Octave 11.1.0 and will fail on anything else. Older releases are still hosted on GNU's archive.
The file you want is octave-11.1.0-w64-installer.exe (543 MB).
I have already put here the direct link to the right version.