If you are installing ARCHICAD 11-15 and Java version 7 is installed, the installers (or un-installers) of ARCHICAD won't work. The two Java Versions will not interfere.
If you are installing ARCHICAD 16 and Java version 7 is installed on your computer, the installer (or un-installer) of ARCHICAD will install the required Java version 1.6.32. If Java 6 is not present on your Windows you can download and install from here. If you are installing an ARCHICAD 16 Hotfix onto a Windows platform Java 6 will be required even if Java version 7 is already installed on your computer. WkConfig requires Java 6, so if it is not present on your computer use Java 6u32 installer from the above list. Three ARCHICAD updates, but probably not the ones you are looking for.
If you installed ARCHICAD 17 with Wibu protection you might need to install Java 6 separately in order to run ARCHICAD with your key. But first make sure to backup, update ARCHICAD 18 & 19, and say goodbye to ARCHICAD 17.
This means that only one version of Java is installed at all times. On Mac the “Oracle” Java is installed onto a dedicated bundle at System Volume: "/Library/Internet Plug-Ins/ugin".
How to downgrade Java 8 to Java 7 On Windows Java versions are installed separately. You can uninstall Java 8 through Control Panel's Add/Remove Programs feature. For version independent information: Install, for hotfix installation problems: Install/Hotfix. Featuring out-of-the-box design documentation, one-click publishing. Design and deliver projects of any size with Archicads powerful suite of built-in tools and user-friendly interface that make it the most efficient and intuitive BIM software on the market.
You can download the latest version from After a successful installation/uninstallation the best is updating Java to the latest version. From here you can download the Java version that was bundled with the ARCHICAD version you have. In many cases newer, older, corrupted Java versions may block the installation and uninstallation of the GRAPHISOFT products. Java versions that are supported by the GRAPHISOFT installers (or un-installers)