Skip Free Invoice not working

Hi,
if I want install Skip Free Inovice show me this:
Unable to find the requested file. Please report this issue to service provider.
Cna you help me?
Thanks
Jan

This section can only be seen by users with a valid subscription.
If you have a valid subscription, please login now

Support is
Offline

It is currently a weekend from where we are at. Some answers may already be available on our documentation

Rest assured that we will get back to your posts as soon as the week starts!

Your time
Stack Ideas time