Can't uninstall without an old .msi

I currently have SketchUp Make 2016 and 2015 installed. I would like to uninstall the 2015 version, but I can’t do that because the file “SketchUp2015-x64.msi” is missing.

Originally this file can be found at C:\Users<User>\AppData\Local\Temp\sketchup_install, which is a bit impractical since that is a temp folder. Temp folder shouldn’t have files that are needed a year later!

So how can I uninstall SketchUp Make 2015 without the said .msi file? Nothing seems to work.