Netware 3.2 license upgrade

Clinet has Betware v3.2 (10-User. Has obtained a Netware 3.12 (50-User) license. Is there an easy way to upgrade without completly reloading OS?
I copied netware.exe to the server.312 directory but get an error message that there is not enough memory for DET. I manually registered the memory to no avail.