Where is "Check for new version"?

Installed TeamViewer on one of my computers. Tried to connect. Was informed that the version I am connecting with is 12 while the newly installed computer is 13.
No described update procedured worked out. It was referred to an entry in Help pull-down menu named "Check for new version". It is not there in my version:

Debian Jessie, TeamViewer version 12 on client system, Debian Stretch, TeamViewer 13 on server system.

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