No Key (json,blf) file is found

Currently i’m trying to update the firmware of EG91EX and EG91EFB modules. With any firmware package (.zip), i have at hand, QFlash (V6.5, V6.4, V4.19) only displays an error message “No Key (json,blf) file is found, this zip file maybe a invalid zip or you downloadmode is not right, please check it”, when “Load FW Files” is requested.
(QFlash V4.10 behaves a bit different: it loads the packages and complains about “file …\TmpDownloadPackage\cfg.ini is not exist” later, when the update is "Start"ed).
What is going on here?

Hi @PeterF
I send the QFlash v6.0 to you,pls try this.