Here is a new beta version for Java 9: JAVA-Multi_Maker_4.0b1.zip
You have to download the Java 9 setup(s) from here (x64) | mirror x64 | mirror x64 | mirror x86 (serving x64 ATM) | mirror x86 .
Copy it/them in the "JRE_setups" folder then launch "_JAVA_Multi_Maker.cmd". Download function may return when Java 9 will be on the official download page.
Tested on Windows 7 & 10 x64, everything works as intended.
The script have been modified a lot, hence the bump in version number:
Removed the GUI option.
Added a new question (to make install passive or silent).
Removed any language other than English and French.
Because Java GUIDs are constantly changing, uninstallation is now done with WMIC.
More switches (see ReadMe), you can now keep previous Java 8 versions (previous Java 9 will always be removed).
Please test and report how it works for you.