Mandar, this is not the normal error thrown by optimiser so it could be unrelated, but Optimiser cannot optimise v17 projects at this time (only earlier versions).

We are expecting a new release shortly.

I used a project created with V13 Pro to optimise for V17 Pro. 

Thanks.

Mandar, can the v13 iwzip be imported into any of your other versions (perhaps even back into v13)?

If it will import into 14 I would export to an iwzip again. You could try optimise that file or proceed thru v15 and v16 (each time via iwzip).

Do not convert to v17 until a new optimiser is released .

Please advise if you have either success or failure.

Ok. Will try it now.

Thanks.