You can create invoices with an unlimited number of line items, and e-mail them to your client who can then pay the invoice online using a payment gateway (all of the payment gateways and language packs that work with nBill standard edition also work with the Lite edition).
I know asking people to pay for support is not very popular, but it is either pay for the software (standard edition) or pay for support (lite edition) - I cannot afford to give away my time for free. The problem you mentioned affects IIS web servers only and will be fixed in the next release.
This listing is for nBill Lite which does NOT need ionCube. MySQLi is required to run it in Joomla 1.5 without legacy mode, but it is not required if legacy mode is on.
But charging for support the get the programm installed I think is really bad though! Sorry ... for that´s a NO GO
An ionCube loader is not required for nBill Lite. I have 2 choices when it comes to earning a living off writing software: 1) charge for the software and make support free or 2) make the software free and charge for support. The standard edition of nBill uses option 1, the lite edition uses option 2 (although if a support issue turns out to be a bug, the charge is refunded). If you want to try it out before paying anything, and cannot get the lite version installed for some reason, the standard edition includes a free trial, with free pre-sales support included.
Support for the paid component is perfect.
Keep up the good work
Thanks for your review - just a slight correction: the Lite edition does not support recurring payment frequencies, only the standard edition does.