Once you've upgraded to a version of Cassandra that uses a new SSTable format, you cannot downgrade the binaries -- for whatever reason -- because the older version of C* will not be able to read the SSTables using the old format.
I'm more concerned that you think reverting to a .0 release is a better option than addressing the issue in the newer version. ;) Cheers! GOT QUESTIONS? Apache Cassandra experts from the community and DataStax have answers! Share your expertise on https://community.datastax.com/.