Hi Mark,
It looks like meraki has updated one of the packages required during the installation. However, it looks like the haven't updated the checksum in the QR code to match the new apk files.
I had to:
create a new network
get the qr code
unencode that qr code with the correct checksum
unencode the old qr code/ get my meraki network id
put the correct network id with the correct checsum in a text string
use an online encoder to create the correct QR code.
I have raised a support ticket with meraki, found the problem and then advised them, so hopefully they will fix it soon.
Good luck
Cheers,
Jay