In fact, you don't really need python as a working python (for LibreOffice) ships already with LibreOffice itself. It is even recommended to use this python binary instead of the system's default to avoid incompatibility errors. The command-line shows exactly that :-)
dag ( 2012-08-20 15:23:42 +0200 )editPlease notice the exact path. It's python.exe, not soffice.exe.
tohuwawohu ( 2012-08-27 20:56:20 +0200 )editI tried to edit the previous comment with no luck. I also tried to delete it. I am using "C:\Program Files (x86)\LibreOffice 3.6\program\python.exe" unoconv -f pdf c:\converttest\testcrap1.doc
But thank you for pointing that out so we don't mess someone else up.
thumper ( 2012-08-27 20:59:26 +0200 )edit@thumper: i've emended my answer with a step-for-step description. The "File not found" output indicates that you're not in the unoconv directory when executing that command. You'll have to run the command from inside the unoconv directory.
tohuwawohu ( 2012-08-27 21:37:37 +0200 )edit
Per comments by @tohuwawohu below, this is probably a bug in unoconv. As of today, the status of that bug is NEW.
qubit ( 2013-01-30 08:47:46 +0200 )edit