Install the software. During installation, choose "Trial" if asked.
Visit the official purchase page. Enter your email address and the software-generated Machine ID (found under Help > Registration). Instant Invoice N Cashbook 10 License Key
A: Absolutely not. Key generators are packed with trojans. Furthermore, modern versions of the software validate keys online. A fake key will either fail instantly or, worse, work for 30 days and then corrupt your data as "punishment" from the anti-piracy code. Install the software
A: No. Instant Invoice N Cashbook 10 is a one-time purchase. However, major version upgrades (e.g., from v10 to v11) may require a discounted upgrade fee. Install the software. During installation