I ma seekingteh following in FLAC.

Electronic Game Music Collection
released 3/21/93

COCC-10689

Opening Theme Collection
released 10/21/92

PCCG-00190

Ketteiban Ranma � Anime Theme Song & Character Song Complete Works
released 8/19/15

B010EB1KQW

1992 Music Calendar - Akane's Diary of Memories
released ???

KACD-3001

1993 Music Calendar
released ???

KACD-3002

DoCo Original Karaoke
released 1/20/95

PCCG-00327

tank you in advance for those who can help me obtain them

You might try checking here: https://nyaa.si/?f=0&c=2_1&q=ranma