Sometimes items do not unpack, so right click Autopar -> Run QuickPar.
Normally all OK but today encountered a 'Warning'
Unable to run program tpo process PAR's
We recomend and use "Quick Par"
This is where you you shout at the program "What do you think I was trying to do "
Maybe the wording needs a slight change ?
EDIT
On trying to UnRar the following warning was presented
UnRAR failed - UnRAR - Unable to find source files to unrar
CAUSE
Somehow I had inadvertently moved the source files, hence unable to find, however the first warning is still a little misleading