Which version of G'MIC do you have problem with? (Linux or windows?)
All version 2.x.x are phasing out (even though 2.9.9 is the latest stable, you will not have the latest bug fixes even if you update the filters)
All version 2.x.x are phasing out (even though 2.9.9 is the latest stable, you will not have the latest bug fixes even if you update the filters)