Pervasive 2000 -> Btrieve 6.10

I've two NetWare 5.1 servers with Pervasive 2000 with 2 user licenses
running on it. Management doesn't want to spend money for additional
connections so I must downgrade Pvsw 2000 to Btrieve 6.10 that is
unlimited, but I'm not sure how to do it without a risk of system damage
- NW 5.1 is pretty vulnerable system, especially in distributed
directory architecture (NDS uses Btrieve)... Maybe someone have
experiences in this kind of operations with Netware and can help me?
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Pozdrawiam / Regards - Andrzej Zbierzchowski