Yes. The software versions go something like beta1, beta2, ..., beta12, beta12a, beta12b, beta12c, v1rc1, v1.00, ..., v1.02, v2beta1, v2beta2, ... v2beta13, v2.00, v2.01, v3alpha1, ..., v3alpha11. Not all the alphas and betas were publicly released. Originally v2 was going to be called "v1.1", but I think all the actual releases were after it was rebranded as "v2". The v3 alphas do not work on Mark 1 hardware.

Peter