I somehow corrupted my fresh installation of Orcad 16.3 on Win7 (missing dll).
Anyway I thought it might be a good idea to migrate to Orcad 16.4 (I'm not sure if our maintenace contract also offer us 16.5).
Since our external layouter is using Orcad16.2 I'm wondering if version 16.4 allows to save as version 16.2
16.4 was never released and became 16.5. If you were in maintenance for 16.4 you will get 16.5. You need to talk to either Cadence or the local VAR who can confirm.
You can save a design back to a 16.2 format. Use File save as then change the type from DSN to 16.2 DSN. Any new functions you may have used in 16.5 will be deleted though.