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I have a requirement where a few people need the latest version of Silverlight 4 installed.

I know the latest version is 5.xx... but apparently with some new software we're having installed we have to use version 4.

After a bit of googling I can see that the latest version is Build 4.1.10329.0 Released May 8, 2012.

We have a mix of Win7 64-bit machines and WinXP 32-bit machines.

My questions:

  • Is there a different version for each OS or the same one fits all? This seems strangely hard to decipher by googling.

  • Does anyone know where I can download the latest version 4? Microsoft do not seem to offer it any more unless I'm just not finding it.

  • Is there a separate browser version of it or will installing it also handle any browser needs? Our new software will be browser-based.

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Well i'm now thinking that the latest version is probably a security patch - but how to get it? I've also noticed Silverlight 4 appears incompatible with IE9 for what it's worth. –  Paul Sep 13 '12 at 9:41
What exactly is your question? It seems unwise to develop software that requires the client and/or customer to download Silverlight from a website not mantained by Microsoft. Why don't you just build it against Silverlight 5 and maintain and only use Silverlight 4 code. –  Ramhound Sep 13 '12 at 10:32
It is external software - i have no control over their development of it. Apparently v5 will be supported from Jan 2013 onwards. Meanwhile we need version 4. –  Paul Sep 13 '12 at 11:12
Silverlight 5 runs Silverlight 4 software. Microsoft only supports Silverlight 5 at this time. –  Ramhound Sep 13 '12 at 11:13
unfortunately i'm told if we have silverlight 5 installed we'll get an error message and not get past the splash screen. –  Paul Sep 14 '12 at 13:07
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