Why can't I install Gangster Vegas mod and Spiderman 2 on my Lenovo K3 Note?

When i download gangster vegas mod apk it says app not installed and also amazing Spiderman 2 can u tell me solution

Why  gangster Vegas mod apk not installed in Lenovo k3 note phones

Go to  Settings > Security > enable Unknown sources then try installing the apps again. Let me know if that works.

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