The following original Dirty engine versions are available for free:

• Dirty 30APR2017
  
  
• Dirty 03NOV2015
  
  
• Dirty 10APR2015
  First SMP version
  
• Dirty 20APR2013
  Replaces 08APR2013. Windows 32 & 64 bit versions included.
  
• Dirty 05SEP2012
  Windows 32 & 64 bit and Linux 64 bit versions included.
  
• Dirty 23MAR2012
  Windows 32 & 64 bit and Linux 64 bit versions included.
  
• Dirty 25AUG2011 (Ponder mode bug fix)
  Windows 32 & 64 bit and Linux 64 bit versions included.
  
• Dirty 11AUG2011
  Windows 32 & 64 bit versions included.
  
• Dirty 24APR2011
  This release features again Windows 32 & 64 bit and Linux versions. It played (slightly modified) last Open War edition 8 contest
  
• Dirty 11D-27
  This release features ONLY Windows 32 bit version.
  
• Dirty ACCA 4 (20 Sep 2010)
  This is the first release featuring Windows and Linux versions. Also 64 bit versions for both OS.
  It played the last ACCA WCRCC championship getting very good results (it played using "Buzz" account).
• Dirty 6J-22
  Played the Open War 7 (since round 20)
• Dirty 14M-22
  
• Dirty 29 Jan 2010
  
• Dirty ACCA 3
  Played in the 2009 Third Annual World Computer Rapid Chess Championships
• Dirty OW5
  Played in the Open War 5
• Dirty 0.99z
  
• Dirty 0.99n
  
• Dirty 20 Jul, 2007
  First Release