6.5.1 is the last version to support private repo. You can see the release details at this link https://blog.axosoft.com/gitkraken-v6-0/#pricing-changes OR https://support.gitkraken.com/release-notes/6x/
And you can also download it (Mac version) from Axosoft https://release.axocdn.com/darwin/GitKraken-v6.5.1.zip OR https://release.gitkraken.com/darwin/GitKraken-v6.5.1.zip
I not sure how to turn off the automatic update function, so if you turn off GitKraken completely and reopen it, it will update to the latest version.
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Updated
Block IP Address for updating
For MacOS
echo "127.0.0.1 release.gitkraken.com" >> /private/etc/hosts
- Windows 10 – “C:\Windows\System32\drivers\etc\hosts”
- Linux – “/etc/hosts”
- Mac OS X – “/private/etc/hosts”