Patches for the full game can be found under the section "バージョンアップ差分ＤＬ" (Version Upgrade Download) from the game's official website. Download the patches marked as "ver1.02f" and "ver1.02h", then install them in that order. You may need to rename the game's executable from th06.exe to "東方紅魔郷.exe" and run the patches under Japanese Unicode settings to properly install them.
Enable DirectInput Output
The game's installer executable may not work under Windows 10, even with compatibility fixes and running under Japanese Unicode Settings. It can however still be manually installed by simply copying the game folder (th06) from the CD-ROM to your computer.
Players have reported the game runs at an uncapped and unstable frame-rate on Windows 10 when played on fullscreen mode, even when using game's internal frame-rate cap enabled. Other potential issues include the game not displayed properly on fullscreen (i.e. game window and title bar being visible on fullscreen) and DLL "Entry Point Not Found" errors.