Why can't I install programs?

I

iMore Question

i see a program I want, download it, it appears in Downloads.
Double clicking the 'package' does something. Installs ? But I can never find it again.
Two examples. Software for my Zyxel NAS and my Canon MP210 scanner driver.
Both download. Both open, and install I presume, both work so I can use them. But are not available again once I close them down. I then have to reinstall them again.
Baffled.
 

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