Any way to batch append page to pdf files?

I need to add a page to the end of every pdf file I have. And I read you can do it with Adobe Acrobat, but I don't have that, I even tried to install the free trial version, but I keep getting some error.

Is there a windows command or anything that can do this for me?

I've been searching all day for this.

Is there such a software?

How many PDFs do you need to edit? I never did find Acrobat very good for actually modifying them.

You could try something like this, though you'll still have to open and merge each one individually: http://www.pdfsam.org/

Have you tried converting it to MS Word and then edit, as shown here:
https://support.office.com/en-us/article/Edit-PDF-content-in-Word-b2d1d729-6b79-499a-bcdb-233379c2f63a