Why does Silverlight install process state that my 64-bit Win Vista OS does NOT support the 64-bit version of Silverlight?

As of Monday 4/20, I've encountered a significant problem with Silverlight on my Vista PC.
Several weeks ago I read a brief item stating that Google would be dropping support for npapi and that it would affect Silverlight sometime in April. One of my key daily apps uses Silverlight, but I didn't receive notification from that software's author
about the pending change and how it would be handled. Successfully used the app every week (Mon-Fri) this month for 8-10 hrs/dy day (as I've been doing for the past ~5+ years: past year under Chrome, year before that under FireFox, ~3 prior years
under IE) and on Fri 4/17 shut it down for the weekend. When I booted up on Mon morning and tried to log into the key app however, it prompted me to download and install Silverlight, acting as though I never had it installed!
I recalled the earlier warning about Google dropping support, so I closed Chrome, started up FireFox, but got the same prompt from the app -- it directed me to install Silverlight. I downloaded it (had no choice as to which version, just got the "Silverlight_x64.exe"
file) and got part-way through the install when this error msg popped up: "Unable to Install Silverlight. Your operating system does not support the 64-bit version of Silverlight". WHAT?! Clicking on the "more info"
link led to this msg: "Message ID: 1518. Your operating system does not support the 64-bit version of Silverlight. Click here for the latest version of Silverlight." That link simply led back to the download page which resulted
in receiving another copy of the same executable file.
According to my system ( > Control Panel > System ), I'm running "Windows Vista Home Premium", with a "System Type: 64-bit Operating System". I've been using this same Vista PC since Sep 2008 and running Silverlight for
around the past 5 yrs.
? -- Why doe the Silverlight installer code flag my OS as not supported?
? -- Is there a way to get an older version of Silverlight that will run under Vista?
Thanks in advance for any helpful comments.

Andy -- Thanks for the link, but I'm not adventurous enough to download from a non-MSFT site.
Besides, since I didn't make any changes to my hardware/software config, I expect a MSFT rep to explain why their two programs suddenly stopped working together and then provide whatever code fix is needed. A phone call to their tech support (predictably)
led to nowhere but a recommendation to purchase one of the company's support offerings (which I declined to pursue). The Silverlight development team appears to participate in these forums, so I'd hope one or more of them offers a realistic solution.
Here's something I forgot to mention in my original post: In several of the threads on this subject (some dating back to 2008!), people have
suggested running IE as the browser vs FireFox or Chrome; however, that idea fails to note that the error msg (Message ID:1518) clearly states that "your operating
system does not support the 64-bit version of Silverlight"; it doesn't say anything about
what browser you're using.

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