Unknown sources

[CMOB]

HI, I'm new to this forum, so forgive me if this has been asked and answered elsewhere. I want to download an app called showbox and need to enable unknown sources on my toshiba portege. I will do the same on my samsung note 4.
What do I do?

 

[Almeuit]

re:

We do not discuss illegal activities on this forum. This is strictly prohibited.
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Thread closed.