Note that you should never 'downgrade' your software version, as this will cause problems in cases where a later software update has updated the device firmware to a later version than what the software expects to find. It always is a good idea to use the most recent software version even if it is a beta.
Current version V2.6.6 11/7/2017 (30 MB) release notes
Current version V4.3.4 11/7/2017 (24 MB) release notes
Current version V2.8.6 11/13/2017 (276 MB) release notes
Reduced size version (36 MB)
Current version V1.0.9 9/14/2015 (10 MB) release notes
TractionControl software is built into SManager, KManager and FlashProManager. Only download this version if you are using a different engine management system.
USB Device Drivers
These are standalone installers with the USB device drivers for Windows XP, Vista, 7, 8 & 10. Note that the USB drivers are exactly the same as those included with the SManager software download above, and the install process is also the same as well.
S300 USB Drivers (8MB)
KPro USB Drivers (8MB)
FlashPro USB Drivers (8MB)