Thank you for your kindness, Grammarly maintainors. ( I've received DM on twitter.)
While installing this,
I was using spreadsheet the gnumeric app of current version, and loading a very old version of a ".gnumeric" file containing charts, it might cause PC freeze...
My silly early detection might found a false reason... it should not be your false...

This time, I lost a chance of timing to install yours... sorry...