You don't need to take those risks. There are outstanding free and low-cost alternatives available today that are safer, more powerful, and fully supported.
No. The activation servers for Acrobat 8 were shut down in 2018. Even with a valid key, installation fails. You don't need to take those risks
No. Adobe has never offered Pro for free except limited trials. Beware of "giveaways" — they are scams. You don't need to take those risks