There is no need to convert. CRD will schedule and work with a mixture of versions. There may be some minor problems with certain functions that CR have changed between the versions, but in the main, you should have no problems.
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Replying to:
Can the CRD handle a mixture of Crystal Report versions. Meaning I have some written in CR8.5 and some in CR9. Should they all be converted to CR9 or can I run schedules with 8.5 and 9 until I can convert them all?