you could use
WinScp to copy this file to the board. You will have to use the address 192.168.6.2 and username
root and no password.
Once the file is on the board (I assume it will go in the home folder
/root/?) you can do the following in the console bottom of the IDE:
(verify it shows
Bela-dev.zip in there)
rm -rf /root/Bela/updates
mkdir -p /root/Bela/updates
mv /root/Bela-dev.zip /root/Bela/updates
wait for this to finish and ensure it doesn't print any errors. Then do
do not touch the IDE until it says "Update successful" (or fails, in which case please show us the error).
Sorry you have to go through this lengthy procedure: the image you have is an unlucky one.