This issue can occur if the "Troubleshooting and Support tools app" in your Confluence instance is not updated. If that's the case, please upgrade this app.
Please check this link for more details: https://confluence.atlassian.com/support/pre-upgrade-planning-tool-973479832.html
Adding to Deepanshu comment, the upgrade planning tool needs access to the public internet to fetch recent data about Confluence versions.
If that's not available, it will check its own local information which was built a few days prior to being released.
7.17 is the latest Confluence version and there were no new ATST releases after it.
If you want to have the more recent data you will need to check the following information from https://confluence.atlassian.com/support/pre-upgrade-planning-tool-973479832.html :
To make sure the pre-upgrade planning tool shows the latest version data, your application needs to be able to access the following URL:
If a connection can’t be established, for example if you’re using restrictive firewall or proxy server settings, the tool won’t be able to fetch any updates to version data, supported platforms or documentation.
In these cases, we recommend updating to the latest version of the Troubleshooting and Support tools plugin. This will ensure the content is current. You could also consider checking the relevant supported platforms page, or allowing access to the URL above.
Thanks @Mehal Rathod
The offline list of Confluence versions for ATST 1.37.0 was probably compiled before 7.17 was released.
Based on the screenshot your instance doesn't have access to the public internet, hence why you don't have the online list as well.
Hi everyone, We’re always looking at how to improve Confluence and customer feedback plays an important role in making sure we're investing in the areas that will bring the most value to the most c...
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