Packages:
instantjchem-VERSION-windows-x32.exe
instantjchem-VERSION-windows-x64.exe
After downloading, double-click on instantjchem-VERSION-windows.exe to start the installer. Instant JChem will be wrapped out into the selected directory.
See Instant JChem Installation and Upgrade for further useful information.
{primary} Instant JChem uses its own Java (that it is bundled in the installer). If you want to use another Java, see How to change IJC's Java.