Dear @rbavery,
from your gpt log I can see errors related to the download of Sentinel-1 precise orbit. DEM is correctly downloaded, and you can also think about using a more recently available DEM (e.g. ‘Copernicus 30m Global DEM’).
From the ‘Apply-Orbit File Operator’ help:
For Sentinel-1, Restituted orbit files and Precise orbit files may be applied. Precise orbits are produced a few weeks after acquisition. Orbit files are automatically download from Array’s servers. If an orbit file is not found, you may try looking for it in https://qc.sentinel1.eo.esa.int/ and placing the downloaded file into the auxdata folder.
I have also received the same error message in the past, that could be either related to server unavailability:
or local firewall configuration:
The GDAL version related INFO message could be manually fixed from SNAP8 by setting ‘Use internal GDAL version’ in: Tools → Options → S2TBX → GDAL Library Loader.
Finally, I do not know why you get the error related to ‘org.csa.rstb.io.rcm.RCMProductReaderPlugIn.findMetadataFile’. Have you tried to set the ‘manifest.safe’ file inside the ‘.SAFE’ input folder as ‘-Pinput’ argument?
Federico