Get the updated version from the creator:
https://github.com/kweatherman/IDA_ClassInformer_PlugIn
Original: https://sourceforge.net/projects/classinformer/
Tested on: IDA Pro 8.2, 8.3, 8.4, 9.0 beta2&3, 9.0
Changes:
- Support PE32 in 64bit plugin
- Updated to idasdk 8.3 / 9.0
Supports IDA Pro, IDA Home and IDA Free