Registered Psychtoolbox-3 installations as of March 14 2016 15:50:13.
Total number of downloads + updates     : 196322
Total number of unique installations    : 70534
Number of PTB's updated at least once   : 19627
Breakdown of installations by Psychtoolbox flavor:
'beta'/'current'              : 64926
'unsupported' aka 'stable'    : 683
'trunk'                       : 37
Psychtoolbox-3.0.7            : 0
Psychtoolbox-3.0.8-PreTiger   : 5
Psychtoolbox-3.0.8            : 27
Psychtoolbox-3.0.9            : 18
Psychtoolbox-3.0.10           : 94
Psychtoolbox-3.0.11-PreWinGst : 1
Psychtoolbox-3.0.11           : 1557
Unclassified                  : 3179
Estimated breakdown by host operating system (*):
MacOS-X all                  :    21225 ( 30.092%) 
Windows all                  :    47170 ( 66.876%) 
Linux all                    :     2139 (  3.033%) 
Linux on ARM embedded/mobile :        3 
Linux   64 Bit Matlab/Octave :     1247 ( 58.298% of all Linux systems) 
Windows 64 Bit Matlab/Octave :    17968 ( 38.092% of all Windows systems) 
MacOS-X 64 Bit Matlab/Octave :    12434 ( 58.582% of all MacOS-X systems) 
(*) Strong underestimate for Linux, overestimate for Windows and OSX!
For Macintosh - Breakdown by system architecture:
PowerMac                     : 1446 (  6.813% of all Apple systems) 
IntelMac                     : 19779
For Macintosh - Breakdown by OS/X version:
10.3  - Panther               : 156
10.4  - Tiger                 : 1864
10.5  - Leopard               : 3023
10.6  - Snow Leopard          : 4054
10.7  - Lion                  : 2047
10.8  - Mountain Lion         : 2350
10.9  - Mavericks             : 3154
10.10 - Yosemite              : 3432
10.11 - El Capitan            : 1122
For MS-Windows - Breakdown by Windows version:
Windows additional preVistas : 1117
Windows 2000                 : 145
Windows XP                   : 14179
Windows Vista                : 2653
Windows 7                    : 23903
Windows 8                    : 4431
Windows 8.1                  : 161
Windows 10                   : 580
For MS-Windows - Breakdown by Matlab release:
Matlab R2007a (V7.4) or later: 41809
Previous Matlab releases     : 5190
Breakdown for all systems by Matlab major versions:
Matlab 5.x                   : 1
Matlab 6.x                   : 524
Matlab 7.x                   : 42267
Matlab 7.0   (R2005a)        : 2177
Matlab 7.1   (R2005b)        : 1324
Matlab 7.2   (R2006a)        : 876
Matlab 7.3   (R2006b)        : 1137
Matlab 7.4   (R2007a)        : 3111
Matlab 7.5   (R2007b)        : 4218
Matlab 7.6   (R2008a)        : 2756
Matlab 7.7   (R2008b)        : 2118
Matlab 7.8   (R2009a)        : 3180
Matlab 7.9   (R2009b)        : 3355
Matlab 7.10  (R2010a)        : 5967
Matlab 7.11  (R2010b)        : 2402
Matlab 7.12  (R2011a)        : 2736
Matlab 7.13  (R2011b)        : 2482
Matlab 7.14  (R2012a)        : 4428
Matlab 8.0   (R2012b)        : 3965
Matlab 8.1   (R2013a)        : 5272
Matlab 8.2   (R2013b)        : 2858
Matlab 8.3   (R2014a)        : 4612
Matlab 8.4   (R2014b)        : 3633
Matlab 8.5   (R2015a)        : 3619
Matlab 8.6   (R2015b)        : 2654
Matlab 9.0   (R2016a)        : 64
Number of GNU/Octave V3+ installations by system:
Octave on OS/X               :      523 (  2.464% of all OS/X installs) 
Octave on Linux              :      371 ( 17.345% of all Linux installs) 
Octave all on Windows        :      171 (  0.363% of all Windows installs) 
Octave 4 on Windows          :        8 (  0.017% of all Windows installs) 
Parsed lines in registration log        : 198550
Invalid (skipped) log entries           : 6