API Version Numbers
The following chart will show which version of Indigo introduced any given API version.
API Version
Indigo Version
1.0
5.0.0 - 5.1.1
1.1
5.1.2
1.2
5.1.3 - 5.1.x
1.4
6.0.0 beta 1 to beta 3
1.5
6.0.0 beta 4 - current