Under Enovia DMU navigator is it possible to save the files in a format compatible with Catia V5R19? Today we can't read them.
Similarly, when you open products under Enovia DMU navigator, they apparently open in Design Mode which slows down the machine a lot, is it possible to change this parameter?
I don't have DMU Navigator but for the first question
Regardless of the licenses used It is not possible to back up to an earlier version without data loss
For example, if I create a part in R20, I can save it in R19 via the utilities, but I would lose the graph (the result is an R19 file with no build history).
The same is true for DMU Navigator , if with this license you use a version of CATIA Higher than R19, the Downgrade to R19 will delete the DMU functions from the model.
For point 2 I guess it's related to the cache management options that shouldn't be enabled