The Java Platform was designed to allow applications to run on different hardware stacks and operating systems without changes. Java is available on both in 64 and 32 bit versions, allowing users to get the appropriate version for their system. The MarvinSuite's installer is also available for Microsoft Windows both in 64 and 32-bit versions and the two architectures need to match, mismatched versions won't work. You can download the JAVA version of your choice from here : https://www.oracle.com/technetwork/java/javase/downloads/index.html
If the Java and the MarvinSketch versions are the same, please set the PATH system variable following this https://www.java.com/en/download/help/path.xml
MarvinSuite is also available as 64-bit Marvin installer with bundled openjdk11 from our download page.