Moving this discussion to the Photoshop Lightroom
Actually, you've moved it to the Lightroom forum not the Photoshop General forum, but that's probably the correct place for it, and just a typo for where you've moved it.
The answer about whether you can delete those folders depends on what's in them. If they only contain installers then Yes, if they have your LR catalog and photos or other files, then No.
The installer for LR on Windows is a little less than 1GB, and you have four or five folders, so that should be a little less than 4 or 5GB, but you say 6.8GB so maybe there are other things in those folders.
Thanks Ssprengel probably was still thinking of the previous discussion I moved.
All those files can be deleted, or put in the recycle bin (assuming they are files extracted for installation, and no catalogs or other important stuff has been put in there too..).
i.e. none are required for Lr to function, and all can be re-downloaded, and re-extracted, if need be.
(I save setup64.exe of last version, and most recent version, so I can re-install without re-downloading, if need be, but such is not essential).
Thanks all. If I looked in the folders I would have seen that I could have gotten rid of them. Lesson for me I guess