Downgrade Adaptive Server 15.7 SP100 to versions 15.5, 15.5 ESDs, 15.7, and 15.7 ESDs in place using the same installation directory the upgrade was performed from.
When downgrading from Adaptive Server version 15.7 SP100 to version 15.5 ESD #4, you can perform the downgrade to the same Sybase installation directory where version 15.7 resides.