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Latest Version 4.8.7 is released on July 17, 2024.
Release Notes

If lyrics are not output, do the following:
Style setting > Note > Lyrics Position > Offset (Time Direction) (Set this value to a small value.)

For Windows, download from below.
MuseScore 3 compliant.
JapoScore Version 4.8.7 for Windows (27682 ダウンロード)

For Mac OSX, download from below.
MuseScore 3 compliant.
JapoScore Version 4.8.7 for Mac (15601 ダウンロード)

For Mac OSX (macOS 10.13.6), download from below. JapoScoreV3.9.12　and later versions cannot run on macOS 10.13.6 (Sorry!)。