Ok let me try again. In the following, 'Auteurswet' is the Dutch copyright law. Also, there are three parties in the example: 'the uploader', the one who provides the work and is assumed not to be entitled to do so (for the example); 'the downloader' who makes the copy; and 'the author', the holder of the copyright.
Also, 'nemo plus iuris' is an abbreviation of 'nemo plus iuris transferre potest quam ipse habet' which means 'nobody can transfer more than he has'. It's a cornerstone of property law which, in the context of physical goods but also of other property rights, means quite obviously that if you don't have rights to something, you can't transfer those rights to someone else. This may seem obvious but it comes into play when rights are retroactively discovered to have never existed at all (which is much more common than one might suspect; for example in cases of bankruptcy, non-payment with a reservation of ownership clause, ...). Then transfers of goods can be invalid and this has serious implications for purposes of ownership, repossession etc.
Anyway, back to the case at hand. First we need to distinguish between two things that can be transferred: the rights to the software, the 'copyright' (this is not a license, forget about 'licenses', it is the copyright itself.) and the software itself that is transferred. Because in English both are described by the word 'transfer' it is extra confusing; the copyright (can be but isn't in this case) 'transferred' ('overgedragen') in the same way a deed is transferred, while the software is merely 'transferred' ('gekopieerd', copied) over the wire. 'Transferring' a copyright needs to be done in writing (art 2 sub 2 Auteurswet), for example, 'transferring' some software over the internet doesn't, obviously.
Now then, the copyright is a 'property right' ('vermogensrecht'), and is with the author (in the case of the example). It is this 'copyright' that the nemo plus iuris sees to; and since 'the uploader' doesn't have it in the first place, he can't transfer it. Which makes sense.
Why then isn't the making of the copy covered by this nemo plus iuris? It's because there is no transfer of any property right going on at all. The downloader doesn't get a property right. The Auteurswet merely says that this specific making of a copy (for personal use, etc.; details are in artt 15 and 16 of the Auteurswet) is not a copyright infraction. That doesn't make the downloader holder of any copyright, or of any property right at all. And that is why the nemo plus iuris principle is not in play here.