That doesn’t look right. Download:
https://gmic.eu/files/prerelease/gmic_gimp2.10_qt_win64.exe or
https://gmic.eu/files/prerelease/gmic_gimp2.10_qt_win64.zip
PS
– I downloaded the *.zip file.
– Searched for all of the gmic*.exe files and found the folder with the plugin version.
– Backed up those files.
– Extracted the zip into the folder.
– Renamed gmic_gimp_qt.exe to whatever the original file was called (mine was gmic-qt.exe).
– Restart GIMP if it is open.