Is there a way to import an application exported from Appian 6.6.1and import in

As a best practice you shouldn't be doing this, even though, some basic items can be still compatible and importable by just changing the Appian-Version in the META-INF/MANIFEST.MF to 6.6.0.0 , this approach is not supported and Appian cannot guarantee this import completely fine, which makes sense if we take in consideration that new versions have new features that may not be present/compatible with previous versions.

As a best practice you shouldn't be doing this, even though, some basic items can be still compatible and importable by just changing the Appian-Version in the META-INF/MANIFEST.MF to 6.6.0.0 , this approach is not supported and Appian cannot guarantee this import completely fine, which makes sense if we take in consideration that new versions have new features that may not be present/compatible with previous versions.