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1

After you try and open QGIS and get the error, you need to open MacOS "System Preferences" and select "Security and privacy". You should now see an option there to run the program below the "Allow apps download from:" section.


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Thought I would provide an update as the earlier user guides are a bit out of date. I used a combination of the website from @Hani Dradi which really helped with the PostgreSQL installation and a second website as I was not sure what applications I should install with PostgreSQL using Stack Builder - the answer was only PostGIS. https://www.geo-gate....


4

Before trying to bypass, the issue you may look at you QGIS version. Some people encountered issues while using EPSG27700 but it seems to be fixed since QGIS 3.10.2 e.g https://github.com/qgis/QGIS/issues/33154#issuecomment-576350494 and another fix for another related issue has been done with QGIS 3.12.2 e.g https://github.com/qgis/QGIS/issues/35665 ...


6

From the download page, there is a link to "Previous releases" that contains 2.18 https://qgis.org/downloads/ That being said, EPSG27700 seems to be readiliy available in newer versions...


0

Thanks a lot, it was the only of several proposed solution that worked for me (kubuntu 18.04, qgis 3.4 Madeira). I really appreciate your post


0

When I checked via 4 Ways To Tell If You’re Using 32-Bit Or 64-Bit Windows it turns out my computer couldn't handle the 64-bit version. By downloading the 32-bit version the problem was solved.


1

Install ESRI_Arcview.zip in C: Drive (this is just a zip of the C:\Esri folder from a previous install) Install Common_files_ESRI in C:\Program Files (x86)\Common Files (again a copy of the previous files) Install Fonts.zip in Fonts (esri_1.ttf to esri_9.ttf) Create a HOME environment variable to point to a home folder Install avenv.ave in the HOME ...


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