I purchased it from !Store (getting a discount for being a NetFetch 4 user) and downloaded. Once decompressed, you get a selection of versions to install. There is the full version, a utility to upgrade an older version of just a copy to overwrite an existing NetFetch 4 installation. I used the last option without issues. There is a detailled readme with full details on installing the software. The archive also includes a version of !Messenger (called NF) and copies of some old RISC OS browsers which may be of interest.
NetFetch 5 is a major update with better SSL support, multiple SMTP server support, better RSS handling and the usual bug fixes. Much of the enhancements are about keeping up with changes in the wider world (such as the way major mail services validate email and detect spam) but there are a couple of new features. Andrew did a really nice talk (now on youtube) covering the features at the London Show.
You can you easily disable the fetching/sending and autosend will now wait a little before it sends rather than sending at once. So you now have a chance to reconsider that hasty reply you scribbled down in anger...
If you are using RISC OS for email the NetFetch update is a welcome addition.
