Search and replace paths in Houdini
If you want to search and replace paths in multiple locations use Windows -> Hscript Textport window
opchange \$DOWNLOADS"/wetransfer" \$JOB"/geo"
Backslash before variables will allow you to keep variables ($JOB and $DOWNLOADS in this case) and not expand them to full path.
Another case: you imported FBX with materials. You can move them to mat context and change path with this:
opchange ../../materials /mat