Older projects missing effects

I’ve started going back to some old v2.2 projects… and have been repeatedly disappointed that the effects aren’t migrating. For example, in an older mix, I might have used “Double Delay” to create a 1/4 note delay… the software knows it should be there, but can’t map it to any new delay effect. Thus, many of my older projects require significant work just to bring them back to where they were. Is there some way to get these older effects? Or for Nuendo 6.5 to recognize them and map them to newer, available effects?


Isn’t it because of 32-bit Nuendo 2.2 and 64-bit Nuendo 6.5?