On my Windows 10 computer I have 2 optional updates available. I clicked on download and install. They never downloaded or installed. Any ideas what is going on? Thanks in advance.

What are the updates?

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Hewlet-Packard-imaging-Null Print-HP Deskjet 3510 series.

Microsoft Silverlight (KB4481252)

The one for the Deskjet 35 10 is probably just a driver update and I would not do. I have found that a driver update through Windows Updates almost always will fail to include the software that comes with the full package. If you want to make sure that you have the latest drivers and software I'd get directly through HP. The following is actually for the 3510 e but such things usually go by series number which would be 3510 series.
https://support.hp.com/us-en/drivers/selfservice/hp-deskjet-3510-e-all-in-one-printer-series/5157460

As to Silverlight don't worry about it unless you have a web page that is failing to display content. Silverlight is a bit like the old Adobe Flash Player as to what it does. I install it but get directly through the Microsoft download page.
https://www.microsoft.com/Silverlight/

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I will take your advice and not do it. Thanks again Jay!

If you ever do need Silverlight, which you likely already have, the browser or software should let you know. Flash Player is already gone and Silverlight is rapidly fading as they just are not really needed any longer. While there are many other programming languages that are used to build web sites HTML (HyperText Markup Language). HTML version 5, which all current browsers support, already includes most of what Flash and Silverlight did such as video and audio playback.

As an add-on here is an interesting project. It is a functional on-line OS. I don't use it but look to see what is being done now and then. I don't consider it impossible that something like this could be the future. This is written in Silverlight. If you can view the thing your browser supports Silverlight and that is all you really need.
https://www.silveos.com/
SilveOS is really pretty cool...

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