If you received intermediate certificates and you need to install them you should simply concatenate them in one file in reversed trust delegating order. So if trust is delegated like this:
root -> intermediate1 -> intermediate2 -> your-site
in pem file certificates should be in this order:
- intermediate2
- intermediate1
- root
P.S.
Installation can be checked with online tools at https://www.digicert.com/help or https://www.sslshopper.com/ssl-checker.html
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