i've noticed that in SFOS V18 downloaded certs are now in CRT instead of PEM format. Strangely enough when you upload certificates into a V18 appliance it doesn't expect a CRT file. Additional work needs to be done with converters before it can be used. This is troublesome if you have many IPSEC site to site connections on V18 appliances. and it doesn't quite follow this guide either https://www.sophos.com/en-us/medialibrary/PDFs/documentation/SophosFirewall/Pocket-Guides/Establish-Site-to-Site-VPN-Connection-using-Digital-Certificates_2.pdf
It would be good if V18 cert download behavior matches v17.
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