Where can I found Adobe reader DC standard edition stand alone download

Also, when you find the right installer: Acrobat Pro and Acrobat Standard have the same installer. They use your license to decide what features you get. Be sure to download the correct thread (subscription=continuous, perpetual liecnse=classic).

Hi

Acrobat Reader is free. Install it from here: 
https://get.adobe.com/reader/

Acrobat Standard and Acrobat Pro are not free. Plans can be purchased here:
https://acrobat.adobe.com/us/en/acrobat/pricing.html

There is no "Acrobat Reader Standard", so that's why your search took you to the wrong place. I hope this helps.

~ Jane