This voicepack is compatible with version 2021.01.01 of RicePigeon's Utsuho Reiuji. If version 2021.01.01 is not the latest version of the character, then either I haven't updated the voicepack yet, or none of the following files were changed:
-Utsuho_RP.snd
-Utsuho_RP.st
-Utsuho_RP-Specials.st
-Utsuho_RP-Supers.st

It is not recommended to use this voicepack with Touhou: Gensokyo Reloaded due to potential desync errors that may Okuu.