Topic covered in the How do I FAQ
[quote:42ubn5bz]How do I open a recent project in an older release - LINK
Newt already answered with the same in your previous topic though.
Also, you should simply update to the most recent release, as long as the education subscription you are using is still valid, the new release will work with your license.
You should at least update your r233 to the latest stable r239.