Software Center - Installing PeaZip gives "programming error in aptdaemon"

[muzak24h]

This is 10.10 (upgraded from 10.04) Firefox launches Software Center and it asks
if I trust software (it's from SourceForge - so I loaded the newest Deb)

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 768, in simulate
    return self._simulate_helper(trans, status_path)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 841, in _simulate_helper
    self._cache)
  File "/usr/lib/python2.6/dist-packages/apt/debfile.py", line 57, in __init__
    self.open(filename)
  File "/usr/lib/python2.6/dist-packages/apt/debfile.py", line 66, in open
    self._debfile = apt_inst.DebFile(open(self.filename))
IOError: [Errno 2] No such file or directory: '/tmp/peazip_3.4.LINUX.GTK2-2_all.deb'

Still fairly new - What to do now?