TaiG has released a minor update to their iOS 8.4 jailbreak tool, which is something you can entirely skip.
The iOS 8.4 jailbreak tool for Windows has received a slight bump from version 2.3.0 to 2.3.1.
However, the update is labelled beta and only includes the latest Cydia Installer 1.1.20.
The TaiG team also commented that it is not necessary to use the new tool, since it’s in beta.
The previous version is what you should use if you want to jailbreak your device running iOS 8.4.
Once jailbroken, you can install the latest version of Cydia Installer by simply launching Cydia and hitting the refresh button.
If you want to use TaiG 2.3.1 beta, you can download the Windows version from our Downloads section.