"Please make sure, that you are using the latest TeamViewer version if you are not a license holder. You may update the remote TeamViewer with a policy" - This information is misleading. You can not use teamviewer policy in a free version. I've started a 14 days Trial - but still can't apply a policy to older (ver. 12) hosts - they are appear offline from the teamviewer website. But they are online actually, and if I try to connect to them - "the remote version is running old" is displayed. So there is no option to remotely upgrade those (v.12) hosts, in any case you have to buy 1-year subscription at lease once, or move to another solution.
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