From a previous post:

"In conjunction with this new update will be a bunch of new tables in Tune, many enhancements to both Tune and Scan, plus 2 sets of new Custom Operating Systems.

Version 2 - This will include the following -
Dual Spark Mafless with Octane scaler control.
Valet mode speed limiter selectable via a toggle switch.
Two Step Rev Limiter for NON ETC cars.

This version is perfect for those who still want to run with a MAF and don't want to have to do a retune as you will have to do with Version 3.

Version 3 - This will include the following -
Dual Spark Mafless with Octane scaler control.
Valet mode speed limiter selectable via a toggle switch.
Two Step Rev Limiter for NON ETC cars.
Full RPM vs MAP Commanded AFR table with one really neat trick!!.
2 OR 3 bar support (up to about 26psi of boost with 10kPa,1.5psi increments) plus a boost timing table.
This new O.S has been completed for most 2001 - 2005 O.S however some will not be finished by release date, but will follow soon after."

Are all custom operating systems version 3 now? How do we select the version that we want to use? I don't see anything mentioned about this on the download page?