I have routinely opened .SID color orthophoto files for several years with QGIS running on a Mac. Currently using QGIS 3.30 under Mac OS X 10.13; I started using QGIS back in the 2.14 days, ~2016.

I have a vague recollection of having to load a MrSID SDK, perhaps 4 or 5 years ago. Perhaps that installation has been persistent since I haven't had to do anything MrSID related since as I updated QGIS.
If indeed a MrSID is needed, it can be found at
<https://www.extensis.com/support/developers>

--
Garth Fletcher

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