Hi Dave. . .
As I'm sure that you know, Windows Live Mail has not been supported by Microsoft for many years now and its code has literally been left to rot.
The code is very old and may not be compatible with newer systems like Windows 10.
I feel for you because I went through the same thing a few years ago when WLM stopped auto-recognizing my Microsoft email accounts and I had to put in port numbers and other info. WLM was my most favorite email app of all time. I miss it terribly.
As I upgraded to Windows 8, then Windows 8.1, problems with WLM got worse and worse. Then when Windows 10 came out, the problems that WLM had far outweighed its continued usefulness to me.
I looked and looked for a replacement and ended up with Outlook 2016 and Thunderbird.
I was shocked that I like Thunderbird as much as I do as I'm not generally a fan of Mozilla.
So, I use both - Outlook 2016 (soon to upgrade to Outlook 2019) and Thunderbird.
Give Thunderbird a try - it is free -
Thunderbird — Download Thunderbird (download starts automatically)
I don't know if you liked WLM because of the way it combined emails by subject, making it very easy to delete all or read all concerning one topic. You can get close to that in Outlook 2016 and 2019. Thunderbird is basically a "line item" email app with no subject grouping - at least I have not attempted to look for grouping options. I like Thunderbird because I can delete emails very easily as the sender and subject are very visible plus the search feature is really good.
Anyway, I'm sorry, but I don't think that there is any help in reviving the now 7 year-old WLM 2012 for use on Windows 10.
If you have used a Microsoft email account, all of your emails are automatically saved by Microsoft, so if you do migrate to Thunderbird and/or Outlook, all of your emails will automatically download and populate your inbox and other folders as soon as you set the email account up.
Also - Thunderbird has a ton of add-ons that really make it a good email app.
Regards. . .
jcgriff2
p.s. Here is some info on your particular error -
Windows Essentials 2012 installation error code 0x800c0006
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Unable to install Windows Live 2012 into Windows 10 & Windows 8.1(Error-0X800C0006)
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Getting Error code 0x800c0006 when trying to repair Windows Live Essentials
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Windows Live Mail 2012 installation issue 0x800C0006
Windows 10 Mail -
Create, read, and respond to messages in Mail for Windows 10