[Therion] PROJ error - no usable coordinate transformation found (not matching proj.db file version)

[Alexandru Pologea]

After installing therion 6.3.3 (and Survex 1.4.15) on Windows 10 Pro, I 
get this error:

"no usable coordinate transformation found"
Full log here: https://pastebin.com/Dkn95nzE

It seems that Therion uses the PROJ installation from my QGIS 
installation (QGIS updated the PROJ path and it points to proj.db file 
path from QGIS's PROJ package).

After installing updated PROJ separately using << osgeo4w-setup.exe -q 
-k -r -A -s https://download.osgeo.org/osgeo4w/v2/ -P proj >> I get a 
similar error. This time it doesn't find the proj.db file at all: 
https://pastebin.com/TcEDbKmF

It seems like Therion/PROJ library is using the path defined in the 
PROJ_LIB path variable so you need to set it back to the proj.db file 
version path that comes in the therion installation directory, in my case:
SET PROJ_LIB="C:\Program Files\Therion\lib\proj-9\"

You can set this globally or for the current batch session only if you 
don't want permanent path modification, in case QGIS or other software 
need it as it was before. If you want to see details on errors from PROJ 
library, you can set a debug flag
SET PROJ_DEBUG=3

Is there another fix?
Maybe a future fix would be for Therion to use it's PROJ distributable 
instead of the default one in the system, if possible.


Alex


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