Just unrar it yourself using winrar on the PC and copy the files to the same directories using ftp. But be aware there are other threads about how bits of it don't seem to work.I copied the file in the tmp "addon.pgi.001.tgz2" but later renamed it "pgi.addon.001.tgz2" why do not you install it, told me "installation complete", but to no avail. There is something wrong.
Just unrar it yourself using winrar on the PC and copy the files to the same directories using ftp. But be aware there are other threads about how bits of it don't seem to work.