Futanarioftheapocalypse-v1.0-pc.7z -

: Futanari of the Apocalypse , an adult survival/RPG indie game.

: v1.0 suggests this is the first full release or a specific milestone build. FutanariOfTheApocalypse-v1.0-pc.7z

If "solid paper" refers to a password for the archive, a specific developer group, or a website source, it isn't a widely recognized one. You might want to check the specific page where you found the link (such as , Patreon , or an adult game forum) for those details. : Futanari of the Apocalypse , an adult

: .7z is a highly compressed archive format. You will need a program like 7-Zip or WinRAR to extract it. You might want to check the specific page

: pc indicates it is the Windows/Linux version (likely a Ren'Py or Unity build).

If you are trying to verify the file or find a specific version, here is what that filename generally indicates:

This is the original version of Bvckup. It was written for Windows XP, last updated in 2010 and it's now well behind times. Use at your own risk, basically.
It has been superseded by Bvckup 2 - a faster and significantly more refined revision of the same idea. Have a look.
http://www.bvckup2.com