Hello,
1) for automatic PDF invoice sending mode, you need to do one more step:
- either need to setup cron job
or
- install and publish the VM Invoice plugin
(see documentation for details)
2) "The upgrade server may be temporarily down. Please, try again later." may be caused by security restrictions at your server.
In such case, download the installation package manualy at
www.artio.net/e-shop/download-area
using your Download ID and the "upgrade from file" at the VM Invoice upgrade page.
Not sure, if there was still an upgrade bug in 1.1.2, but if the procedure described does not work, simply uninstall and reinstall the whole thing.