Okay I removed FB 2.0, went to the download page and clicked on CSS Form Builder 2.0.1 (HTML Editor Compatibility Release) (16.3 Mb), and then downloaded and installed CSSFormBuilder_023.mxp. But when I look in extension manager, it says FB 2.0.0.
Before I go any further, I need to ask if that's right because that's exactly what my old FB extension said.