No Support for IAP-92/93 Starting with 6.4.3.1-4.2.0.0 release, Instant does not support IAP-92/93 devices. Do not upgrade an IAP cluster containing IAP-92/93 devices to Instant 6.4.3.1-4.2.0.0 or later version. In case of an accidental upgrade, the IAPs will be automatically downgraded most of the time. You can also manually downgrade IAPs to an Instant 4.0 or 4.1 release, without losing the existing configuration.
The above is from release notes of first 4.2 release, which supports cloud guest.