English translation installation instruction available here (Releases page)
God bless the soul of the author of this article: https://haniwa.technology/alice-tools/README-ain.html
So, apparently, with alice-tools it's very easy to edit the text in the game to translate it.
And, as we all know, nowadays ChatGPT is a thing so it should be rather easy to translate the game with rather fine quality.
I'll put here the scripts and their output.
Youtube recordings of the walkthrough with this English patch: https://www.youtube.com/playlist?list=PL_mejOc9nYCLg6V_FI9ISiafdjH2CW2Mv
You can obtain the game copy here: (please, support the developer!) https://www.dlsite.com/pro/work/=/product_id/VJ011759.html
Alternative link: magnet:?xt=urn:btih:56a41b8aca7f2753ad58f96d69def852ddf7dd41&dn=Rance%2010&xl=4262760435
- Install node.js
- Run
npm ito install dependencies - Run
npm run regenerate-ainto replace yourC:\Program Files\AliceSoft\ランス10\Rance10.ainwith translated version (you will likely need to either open terminal as administrator for that or change the access of theC:\Program Files\AliceSoft\ランス10\folder to "Full Access" for "Everyone" group) - Run
npm run regenerate-exto do same for theRance10EX.exfile that translates skill descriptions, character descriptions, quests, etc... - Run
npm run regenerate-packto translate some UI elements, like settings menu
(there are also some image translations in Rance10CG2_v1_04 and Rance10Flat_v1_04 folders, but for them there is currently no simple command)

