Latest Version 3.6.0 is released on October 26th, 2020）Release Notes
For Windows, download from below.
MuseScore 3 and MuseScore 2.2 compliant.
“JapoScore Version 3.6.0 for Windows” をダウンロード JapoScoreWin-3.6.0.zip – 4865 回のダウンロード – 15 MB
Download error occurred. Downloader plugin was reset and now downloading works fine (I believe). （2020/8/18 22:15 JST)
If not, please report. Thank you.
For Mac OSX, download from below.
MuseScore 3 and MuseScore 2.2 compliant.
“JapoScore Version 3.6.0 for Mac” をダウンロード JapoScoreMac-3.6.0.zip – 1721 回のダウンロード –