How to install SSL to my local server?

my website works fine with https
I’ve added some A records (subdomains) and pointed them to my local server by it’s public IP. Proxy status is DNS only and TTL is auto.
Now it works fine with HTTP (for example
but not works with https (
my local server is windows server, IIS

Not really Cloudflare related I am afraid.

We need pfx format for windows server IIS
i logged in to my cloudflare account --> SSL/TLS --> Origin Server --> Download
I didn’t find PFX format

Is this possible to use this certificate which we have here for our website ( to use in our sub-domains (* which they are hosted in our local server in different OS like windows, ubuntu, etc… ?

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