"Unable to extract site.zip file. Please contact support."

Hi,

I just tried to migrate from 3.9.19775 to 5.0.21 and the installation stopped with the message:

"Unable to extract site.zip file. Please contact support."

I then tried installing again with the 5.0.21 launcher and the message is:

"Error
There was an error uploading this file to the server.
Unable to find install package"

The site now has an error on the frontend as you can see:

http://www.findavoice.org.uk/

Please help

Thanks,

Dave.