I am stuck working with QGIS on an older iMac running OS 10.8.5. I've installed QGIS 2.18.14 and it generally works very well, but I'm running into some issues that get in the way of my work flow. I wonder if I should install an older version of QGIS to get the functionality I need on the older OS... specifically, I am finding that:
- Styling layers works strangely - as per this thread from a couple of years ago: QGIS just installed on MAC OSX - vector layer styles do not work properly
- Exporting the Atlas as images does not give me the option to choose a file format, as per this 2-year-old discussion - https://issues.qgis.org/issues/12435. It lets me choose the directory to save to, but always uses JPEG. I would prefer to export to PNG to get uncompressed output. My back-up is to export PDFs and convert PNG using other software, but I would rather just use a version of QGIS that worked...
If I should install an older version of QGIS, what version should I choose? 2.8 seemed to help some people with the first issue - but that's quite a few versions back now. Maybe something more recent could work? Trial and error?