It is and you can't unless you use the modpack for that version, however, the modpack is extremely outdated and it is instead recommended to just switch over to the main Japanese version repack, which has all Party has and more.
Surprising given that RX8 was the one to really screw with multiple mods and even the character maker, did you make sure to revert back from 6.0.2 to 5.1?
Either keep RX7 or move straight to RX10.1, RX8 isn't worth the hassle. This thread REALLY needs to be updated, the version here is now three updates behind.
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All repack versions are uncensored.
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for the latest, which RX8 is not