Consider setting version numbers on the DotSpatial assemblies.
 
Otherwise the DLLs can not be used in setups because the DLLs are not always replaced (the version number is not higher). Please set all version numbers to this value (file version, product version, assembyversion).
 
This has to take into account a way of redirecting bindings so that extensions do not need to be recompiled for minor version number changes.