This utility might help reduce the size of the C:\Windows\Installer folder; however, it should be used with "caution". Worked okay for me on Windows 10x64 Pro Build 17763.194 V1809 and found ~200 mbytes of orphaned installers.
There is a known conflict with the MSI versions of Microsoft Office. Using the utility breaks the online updates for Microsoft Office. Unfortunately, the author of the utility never fixed this. The Click-to-Run versions of Microsoft Office are not affected.
Mine is at 825MB in total size on Win10 so not an issue yet. With all the cloud this and that I wonder why some things that would get stored locally can't just be fetched from Microsoft in the "cloud" if it's missing, instead of consuming allot of local storage space.
Then again I might be dreaming about an OS that will never exist because they can't even make Windows remember what most would deem simple like opening certain dialog boxes in the same user chosen place, still a mess for decades.
- I had a similar program but that removed all those *.msi *.msp files. But this program seems to be much better, is much more cautious, selective.