Thank you for the reply. Sorry for the confusion. I can elaborate the situation a bit further.
We have end users at our company using KNIME 3.7.2. I am developing new nodes and workflows for our needs using directly KNIME SDK (target platform night-build). All workflows are tested within KNIME SDK runtime.
Since the night-build is updated to 4.0 now, all workflows I tested with KNIME SDK is no longer compatible with the KNIME 3.7.x which end user is using. End user cannot use these workflow anymore and this is quite a massive problem. We are looking for some way to export workflow from KNIME 4.0 to the old version which the exported workflow can be used by KNIME 3.7.x again.
We did consider upgrading end user’s 3.7.x to 4.0 but all community extensions have problem (since the support goes to 3.8.x only). There are several dependency problem when installing community extension with 4.0. This is after we test upgrading from 3.7.x to 4.0.
So we would like the 4.0 able to export workflow into a format which 3.7 can import the workflow. We did try to upgrade the user 3.7 KNIME to 4.0 but most community extensions supports upto 3.8 and installation of these extensions also failed due to dependency conflict.
Hope the story is a bit clear now.