Firstly, Many thanks for the utility, that I use since many years ago.
I have just download the portable application directly in this web and I have found this in virustotal. I think it is a false positive, but could it be fixed in some way?
Just to follow up on Kroozer's slim suggestion. The dll in question lang-1059.dll is identical in both the portable and slim (and regular) installers. This was confirmed, by me just now , via SHA256 hashing, uploading both versions of the file to VirusTotal and a manual look at the two files using WinMerge.
The reason the installer version doesn't flag it is that the dll needs to be compiled before it's apparent to a scanner.
To the original poster, while this is likely (as I and others stated) a false positive, as long as you don't need to have ccleaner in Belarusian (language 1059) you can delete the file and all other lang files which you don't need