From NCH Software:
Free billing software for managing client accounts, quotes, orders, billing, invoicing and applying payments. Make your business excel with an online console so multiple users can create invoices, reports and apply billing payments from their web browser. Express Invoice allows you to create templates of recurring invoices for ongoing services and link to credit card gateways to easily process payments for goods and services. Express Invoice also includes a number of standard reports such as unpaid accounts, payments, salesperson, accounting and billing reports. Express invoice features: Easily save and send invoices from the application by fax or email. Save and store customer information to quickly and easily bill multiple businesses. Secure remote access via mobile devices. Online Access available for multiple users to securely connect with data and create reports, invoicing and apply billing payments. Automatically send billing statements to customers with overdue payments. Quickly and easily change the look of your billing invoices with a dozen new pre-designed templates or create your own. New invoice styling options give you control over colors, layout, text styles and more. Regional format settings include currency symbol, decimal point display and paper size. Set up multiple tax rates to customize invoicing as needed. SMTP email send settings include Secure Socket Layer (SSL). Express Invoice integrates seamlessly with Inventoria to help maintain insights on levels of inventory throughout the scope of your business.
Sorry to hear that you ran into some issues. The free version should be completely free and allow you access so we're not sure what happened here. Could you contact our support team so that we can fix this for you?