Adobe has announced that Adobe Shockwave will not be supported anymore. Effecitve from April 9, 2019 Adobe Shockwave for Windows will no longer be available for download. But Adobe added that "Companies with existing Enterprise licenses for Adobe Shockwave continue to receive support until the end of their current contracts"

Please note that Adobe has discontinued Adobe Shockwave for macOS on March 1, 2017. 

So, even if you have Adobe Shockwave installed in your environment, Patch Manager Plus will not list its patches under 'Missing/Installed Patches' view. 

For more information, refer the official notification from Adobe below.