see that red box? in it is a button with no text. press it and the Output-Dir field will be filled automaticly with {appdata}\
saves time and errors
also, are you sure you want your bin files on four different dvds?
just leave the fields empty and everything is ok.
btw: precomp 0.42 causes crashes with 0.42 created archives, i just used 0.41 and it worked fine.
but i never used the loose unarc.dll y_theknight gave us