I just checked my Netobjects Fusion 12 which I have on my computer, and it also won't open.
However, I also have a copy of NOF 15 which I received from my website host as a free benefit, and it still opens fine.
Sadly, NOF hasn't been updated in years it seems and their templates are so dated.
In my opinion it would be better to move on to some other program that has kept in step with the times.
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