How do install from unknown sources?

My 18382 GM Tablet could not start recently and was sent back to Lenovo for repair. They reimagee it and now I am trying to install the apps I had on this subject before. An application is not on the Play store or App store. I don't see an 'unknown sources' option under 'Settings' > 'Applications' for me to intall with the apk file.

Where I find or activate the option?

I found the answer. It's under settings > Security > device management > unknown Sources

Tags: ThinkPad Tablets

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