A repair software package. Shared as “GBWhatsApp_8.00__9855_UserUpload.Net_UserUpload.Net.apk” — a .apk file, 48.1 MB.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @led_software. Enginerys does not host this file.