Unable to open ".flair" file normally

Dear Junjie,

the Flair files from the Online training (FLUKA Beginner Online Training (Oct 5-16, 2020) (5-16 October 2020): Overview · Indico) are only compatible with Flair 3.

Also, please keep in mind we only provide support for FLUKA version (currently 4-1.1) released by CERN at https://fluka.cern

Cheers,
David