Regarding confluence upgrading
Hi, you can find what is the lalest stable version of Confluence here:
https://www.atlassian.com/software/confluence/download
You can also check what is the latest LTS version here:
https://confluence.atlassian.com/enterprise/atlassian-enterprise-releases-948227420.html
Regards
Jack's answer is better, but for the really curious - https://iapetus.fyi/ will list the latest versions of all Atlassian software. Grabbing it from the official link is always recommended.
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