Download JRE from Release tab:
- 32 bit JRE: jre-8u261-windows-i586.tar.gz for 32bit
- 64 bit JRE: jre-8u261-windows-x64.tar.gz for 64bit
and run following command in the decompressed folder:
@for /R %%f in (*.pack) do ("bin\unpack200.exe" -rv "%%f" "%%~dpnf.jar" | find "Unpacking")