I’m pretty sure it’s the same problem I had on my old windows 10 install.
I had described and found a fix here: https://github.com/OSGeo/grass/issues/2025#issuecomment-1003441506 What I understand is that the included certificates for Python are outdated, and they are not updated when installing a new GRASS version (through the OSGeo4w setup, like for QGIS), since the Python versions might not change. When I reinstalled my computer with the same versions that had a problem, passing from win10 to win11 on the same day, the problem wasn’t there. This also caused a problem when trying to download a dataset from the start screen, so you might want to check if you can download a sample location too. Edouard Choinière Le 21 févr. 2022 à 10:05, Francesco Geri <francescog...@tim.it> a écrit : Hello, we have some problems with addons download in Grass 7.8.6 legacy. The menù command "Install extension from addon" produce an empty list. If we try to install extension from command line I obtain this: g.extension extension=r.diversity operation=add Downloading precompiled GRASS Addons <r.diversity>... ERROR: Cannot open URL: http://wingrass.fsv.cvut.cz/grass78/x86_64/addons/grass-7.8.6/r.diversity.zip but if I paste the repository addres sin a browser we correct download the zip file of addon, i.e. the addon exist, but Grass can't download it. How can I solve this? Thanks, Francesco
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