Adobe page about this problem, IT has added some more contact to help users out: https://creativecloud.adobe.com/en-CA/learn/acrobat/web/extract-pages-from-pdf
1. Go to the to the top left side and click on the tab "All tools"
2. Click on the tab "Organize pages"
3. You should get the text below and click the "Select a file" button bellow
4. Choose the file you want to extract pages from
5. Select Extract in the top menu
6.Highlight pages you want to extract
To extract a set of consecutive pages, click on the first page you want to extract, then hold the Shift key (Windows and Mac) and click on the final page you want to extract to highlight the set.
To extract non-consecutive pages, click a page to extract, then hold the Ctrl key (Windows) or Cmd key (Mac) and click each additional page you want to extract into a new PDF document.
Click the “Delete Pages after extracting” checkbox if you want to remove the pages from the original PDF upon extraction. Click the “Extract pages as separate files” checkbox to extract each highlighted page as a separate PDF file.
7. Click Extract to extract the selected pages
Click the blue Extract button to create a new PDF file of the highlighted pages.
8. Save your new PDF through File > Save or File > Save As and name the pdf as you like