You can follow the guide provided by dolbyman and the file download link to install the application step-by-step. In theory, you shouldn’t need a specific version number; you just need to select the corresponding file to install.
For reference: How to install QNAP applications (.qpkg files) manually? | QNAP
If you run into any issues during the process, could you please provide a screenshot? This would greatly help us understand the problem you’re facing!