I looked at this a few months back. Basically there is no good solution currently for installing large files. I ended up distributing a small installer together with a set of .tbz2 files and using the 'untgz' plugin to decompress the files: the 'untgz' plugin was the only one that I found that could handle files that were larger than 4GB.
If your individual files are smaller than 2GB then you can compress them into individual zip files (so long as no zip file holds more than 2GB of data you're OK). Then there are various unzip plugins which will work. However, there's no solution that will let you distribute a single >4GB installer.
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