Client https website access has been prompted distrust, I found that the certificate is issued by the WSA certificate.How can I make the client visit the website no longer prompt certificate distrust?

My server is too old, ISE version 2.2.I will replace it with a new and higher configuration server, upgrading ISE to 2.7 or 3.0. I would like to know if my previous Lisens can be migrated for free or if I have to buy a new One? Can configuration migr...