[Qgis-user] Get_Qgis_to_read_sid_files

[carto at geoworx.org]

   Greetings List;


   I am new to Qgis, tho not to GIS generally.   I thought I may post 
this question; apologies if not the proper venue, but I perused the 
earlier threads to see if it was proper, and perhaps find an answer.

I am trying to get Qgis to read .sid image files.

   I am using a macOS, 10.11 (el cap).
   Qgis  2.18.7

My understanding so far, this is the order of install.
   Qgis (of course)
   GDAL_Complete-2.1
   GDAL-MrSid_plugin-2.1.1

   (all from KyngChaos)

   They all installed with no errors (good, but errors still possible), 
but now the part I do not understand:
    In the readme for the MrSid plugin above, now I must obtain DSDK file 
from Lizardtech:

     MrSid_DSDK-9.5.4.4703-darwin15.universal.clang70.zip

   I am told to simply copy and paste the files from the .zip; I guess 
keeping the file structure, but where do they go?

   Again, within the GDAL MrSid readme file, it directed to copy only 
four files to Library, but now I am told all the files need to be copied 
somewhere.

   After this, then two sudo commands (also in the GDAL MrSid readme)

   Related to this (perhaps), the GDAL 2.1 install went into the root 
Library  (  /Library  ) and not the user  ( /users/userme/Library  ).   
I know enough of unix to be dangerous, but not proficient.
  Would this be related?

    Hopefully I made some sense of my question.   I can elaborate 
further.   There is probably a simple fix for this; so apologies for the 
newbie question.

    Thanks and Regards,