Hi
The current installer will not make it possible. Simply you cannot select in the installer the v5 because it does not exist. But even if you try to copy manually the files from v4 to v5 it will also not work because the DLL does not know (yet) the v5 so please DO NOT mess with that.
We purchased yesterday the v5, literally I'm just installing v5 on my computer. We need to find out the installation environment of v5, the registry entries. Than we need to reprogram the DLL, than reprogram the product activator, than new intaller needs to be done. Than it needs to be tested intensively before it is released. It is relatively complex job involving a lot of parties so we would like to ask you to be patient. As soon as we have some progress we will let you know.
Furthemore I'm considering to make the installment as 'add-on.xml' type installer as it is requested all the time. Of course this would also add some more complexity to the issue.
Stay tuned!