To all...
The zip uploaded is the untouched/unmodified zip downloaded from the dlsite. No f@cking files are missing and no, they are neither corrupt nor miss-encoded.
Either:
1) change your applocal to japanese, reboot and then extract it, or
2) use winrar or bandizip, select the japanese language in the encoding settings and then extract it.
With Winrar
open the archive and select
"Options->Name Encoding-> 932 (ANSI/OEM - Japanese Shift-JIS)" and then extract
With Bandizip
open the archive and select
"Code page -> Japanese" and then extract
And for those that want the previous vesion use the unpacker from
https://f95zone.to/threads/rpg-maker-unpacker.50/
extract the files and replace them with those in the "mai previous version.rar"
As for the uncesored version it seems that kagura will release both Mai and Cistina on steam
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