Select Build:  

  
Understand-Japanese 5.1(988) Understand-5.1.988-MacOSX-x86-Japanese.dmg  
Understand-5.1.988-Linux-64bit-Japanese.tgz  
Understand-5.1.988-Windows-32bit-Japanese.exe  
Understand-5.1.988-Windows-64bit-Japanese.exe  

Build Logs

Linux Install Instructions

Need an older version?