Hi Sajid, On Windows, addons are distributed as precompiled binaries for a specific version. 7.8.6 is just a release candidate, so there are no pre-compiled addons yet. With OSGeo4W Version 1, which you can get here: https://download.osgeo.org/osgeo4w/osgeo4w-setup-x86-v1.exe you can get GRASS 7.8.5 where installation of addons works fine.
In order to make addons work for GRASS 7.8.6 we would first need a release and then packaging of addons for that version. So no quick fix. As a workaround you could download the required addons for GRASS 7.8.5 and ask your students to extract them into their user profile, which is typically: C:\Users\%USER%\AppData\Roaming\GRASS7\addons\ That is a hack of course but should work (though I have not tested)... As for your related questions: 1) Might be a good idea to support installation of addons from local zip files. At least for Python scripts that should generally work. There is already a similar feature request in here: https://github.com/OSGeo/grass/issues/625#issuecomment-797414504... 2) Not sure I understand the question correctly, but you could check if an addon is present (e.g. with https://grass.osgeo.org/grass79/manuals/libpython/script.html?highlight=find_#script.core.find_program) Hope that helps a bit (though it may be late for your course). Cheers Stefan ________________________________ Fra: grass-user <grass-user-boun...@lists.osgeo.org> på vegne av Sajid Pareeth <spare...@gmail.com> Sendt: torsdag 29. juli 2021 16:48 Til: GRASS user list <grass-user@lists.osgeo.org> Emne: [GRASS-user] Error with installing addons in Windows Dear all While installing an addon using g.extension in Windows 10, gives the following error. "ERROR: Cannot open URL: http://wingrass.fsv.cvut.cz/grass78/x86_64/addons/grass-7.8.6RC1/r.series.lwr.zip<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwingrass.fsv.cvut.cz%2Fgrass78%2Fx86_64%2Faddons%2Fgrass-7.8.6RC1%2Fr.series.lwr.zip&data=04%7C01%7C%7C63bfed4d4eea4b708e4d08d9529fffdb%7C6cef373021314901831055b3abf02c73%7C0%7C0%7C637631669417533127%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=7Z5m4E2VcKIdpehXbq%2F8b6prPQkB%2FLx2428jwRt7NsE%3D&reserved=0>" I see that the addons for 7.8.5 are accessible: http://wingrass.fsv.cvut.cz/grass78/x86_64/addons/grass-7.8.5RC1/r.series.lwr.zip<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwingrass.fsv.cvut.cz%2Fgrass78%2Fx86_64%2Faddons%2Fgrass-7.8.6RC1%2Fr.series.lwr.zip&data=04%7C01%7C%7C63bfed4d4eea4b708e4d08d9529fffdb%7C6cef373021314901831055b3abf02c73%7C0%7C0%7C637631669417543124%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=5pmClXaSPsn4ZmHKboj0P78vmoFkfDgR0ZoH8irx%2B5g%3D&reserved=0> ; But not accessible for 7.8.6RC1. The latest OSGeo4W setup gives two GRASS GIS versions: 7.8.6RC1-4 and 7.8.6RC1-5. So there is no option to install 7.8.5 using OSGeo4W. Any quick work around for this issue? I am in the middle of providing training, and it would be great if there is a quick fix. Related questions: 1) Is there any way to install an addon from a local zip package or url in Windows? In the manual it says it works only for Linux and Mac. 2) Is there any way to skip installation of an addon, if it is already installed? Useful within a python script. Many thanks in advance Best Sajid
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