License check script doesn't work on Windows

Windows doesn't support `$(date +Y)` which was added in #48

```
Replacement value $(date does not match regex it is to replace: [0-9]{4}
Command failed
```

Start by locating the license check script and reviewing the date substitution introduced in #48. Reproduce the reported replacement error on Windows, then verify that the license check completes successfully on Windows as well as its existing environment.

Written by the indexing model from the issue text.