The trial version (0.3.2) is free and the version is old, but there are no functional restrictions. You can save the file and use it forever!
You can download it on the top page. https://1oogames.itch.io/lovely-composer
The basic functions are the same, and it's simpler, so it's more for beginners than newer version.
And if you want more improvements, we're glad you buy!
(We haven't d the latest trial version because it is trouble some to set restrictions such as the number of days.)