How do I install unauthorized apps on Android?

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Tags

1. #application
2. #settings
3. #manager
4. #transfer
5. #unknown
6. #security
7. #sources
8. #party
9. #simply
10. #third
11. #prefer
12. #download
13. #switch
14. #package
15. #device
16. #android
17. #whatever
18. #toggle