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For the current version as of March 2016.
There are a few things to watch out for (prep, settings and bug workarounds!) so I hope this helps.
How to use LetsEncrypt Free SSL HTTPS certificates on Windows Server 2008 R2 or Server 2012 R2 and IIS using ACMESharp.
OUT OF DATE - Other Video - How to Renew when approaching the 3 months / 90 day expiry: • March 2016: How to renew Let's Encryp... - OUT OF DATE
To renew you need to go through the entire procedure again with a different name (e.g. put the date on the end?).. for example:
New-ACMEIdentifier -Dns candycards.co.uk -Alias candycards.co.uk_Identifier042017
For SAN certificates you use the command similar to this:
New-ACMECertificate candycards.co.uk_Identifier042017 -Generate -AlternativeIdentifierRefs www.candycards.co.uk_Identifier042017 -Alias MultiDomain_Certificate042017
Remembering to have created an identifier and validated both candycards.co.uk_Identifier042017 and www.candycards.co.uk_Identifier042017