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Using qBittorrent v4.4.5 Win 10 x64
Are there any important reasons why I should upgrade to the latest version, I'm mainly thinking about stability, security and performance?
I hesitate because of the extremely ugly GUI and icons in the newer versions starting with the 4.5.0 release.

No.

Only need to use the latest version if you use the WebUI/-nox version; but if you do that, you should not expose it to the public internet anyway.

Thank you Peter for a very good and clarifying answer, it is much appreciated!
Best regards,
miracles