(If you need an actual activation link, I don't have any information about it. You may need to check the official website of the software or contact their support team to get a valid link)
https://[official-domain].com/activate/IM2119ML?key=XXXX-YYYY-ZZZZ invoice manager 2119 multilingual activatio link
Compare for current multilingual billing tools. (If you need an actual activation link, I