I OWN KOMPLETE 8 AND I REALY LIKE BATERRY 3 PERCUSIONS, CAN I RE-INSTALL IT ON MY NEW MAC?
No, Battery 3 isn't supported after MacOS 10.10 or higher. This is confirmed here - https://support.native-instruments.com/hc/en-us/articles/360000549845-Where-Can-I-Download-the-BATTERY-3-Installer
You can convert Battery 3 kits to use in Battery 4 as described here - https://support.native-instruments.com/hc/en-us/articles/209544849-How-to-Access-BATTERY-3-Kits-via-the-BATTERY-4-and-MASCHINE-2-Library-Browser