Downloaded a program - not going too well...

I use FreeFileSync on my windoze computers, and I thought I'd get it for 
my Ubuntu computer too.

Sourceforge appears to detect my OS, because when I download it, the 
gzip archive has "Ubuntu" in the name. I assume it's pre-compiled for a 
PC platform.

The gzip archive contains a folder, with the executable and some 
ancillary files.

First question: where should I put this? Yes, I know I could put it 
anywhere, but if you were trying to find a downloaded program on someone 
else's computer, where would you look FIRST? Anyway, for now, I unzipped 
it into /home/andy/ so that the executable is in /home/andy/FreeFileSync/.

When I double click on it, nothing happens.

I've looked at its properties, and it seems to be owned by me, and it's 
labelled "executable". If I right-click on it and choose "open", it asks 
me what application I want to use, to open files of type "executable".

FreeFileSync doesn't appear in the Synaptic Package Manager, that's what 
I usually use.

What on earth am I doing wrong?

Oh, I just tried something else - I tried executing it from a shell. It 
complains:
andy@Boots:~/FreeFileSync$ ./FreeFileSync: error while loading shared 
libraries: libunity.so.4: cannot open shared object file: No such file 
or directory

Any ideas? (libunity isn't in the package manager either.)

-- 
Andy
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