preciso assinar o Adobe ou é gratuito?

Adobe Acrobat is not free. Acrobat Reader is free.

Hi @ADRIANO5FA8 

Hope you are doing well.

As per the issue description that you want to use Acrobat Reader without signing in. Yes you can install and use the Acrobat Reader DC without the need to sign in. 

Here is the direct installer link: https://get.adobe.com/reader

Let us know if that helps.

Thanks,

Harsh