We are aware of the problem, a filthy bug prevents old projects to load with newer version of the CS-80V.
It affects only AU versions.
We are currently building the corrective.
As a temporary workaround:
1. Delete the faulty AU plug-in in <Mac>/Library/Audio/Plug-Ins/Components/
2. Install the 2.0 version
3. Move the new AU plug-in in another safe place (let's say your Desktop)
4. Install the 2.5 version
5. Move the 2.0 AU file back to the plug-in folder <Mac>/Library/Audio/Plug-Ins/Components/
6. Launch Logic, validate the plug-in in the AU Manager, launch your old project: you have your settings restored.