Create Geospatial PDF (GeoPDF) is greyed out in PDF export options in QGIS 3.10

For clarity (Windows 10)

Download the OSGeo4W (64 bit) https://qgis.org/en/site/forusers/download.html

Install as Advanced Install

Change the default GDAL to 3.1.0.137

Then in QGIS you should get the option for Exporting to Geo-PDF

Hopefully soon (when GDAL/GRASS is updated) this becomes the default in the QGIS install.

the official release qgis 3.10 is compiled against gdal 2.41, therefore this option is not available. if you need this feature at the moment there is a workaround use the OSGeo4W networkinstaller and activate the gdaldev option

please see this tweed https://twitter.com/mapperz/status/1188607950824206336?s=20

The QGIS and GRASS team is busy preparing a new build with GDAL/OGR 3.x support. It will be available soon (some days max). Please be patient until then.