in both Windows 7 and Windows 8 either 32 bits or 64 bits operating system. Those MGS cache file is normally hidden in C:\ProgramData\MGS those are 11GB worth of data on my computer. Thats the only folder MGS use mostly for storing games data and caches.
To reveal ProgramData folder: Click View tab, click Options icon drop down and select Change folder and search options.
Dialog will come up, select view tab, then click on Show hidden files, folders and drives. Press Apply and then Okay. Go back to file explorer and find that. You will see there it is. Make sure you completely uninstall Microgaming software before doing so to delete MGS folder only in ProgramData to recycle bin, then delete that off in recycle bin. It will save a big hefty space in your hard drive.
Nathan.
PS If you want to hide those files, folders and drives, repeat the step in Change folder and search options and choose Don't show hidden files, folders or drives, press apply and okay. Thats all you have to do.
Options 2:
Uninstall Microgamings.
In ProgramData folder, move that MGS folder to your external hard drive to save it copy for later on if you are planning to reinstall that MGS software at later time. So that will save you from having to redownload large file size. But sometimes microgaming may have new update files that will overwrite over exist for you though.