PDFSAM or PDF Split and Merge is a wonderful tool for working with PDF files (e.g. split one PDF into multiple files, join multiple PDFs into one file or reordering the pages within a PDF file).
Unfortunately, the default installer available from their home page or source forge comes bundled with some ‘free tools’ to improve your browsers search bar. Some adware scanners might thus strongly discourage you to use this otherwise awesome applications.
Thankfully there the developer also provides a download link for an installer without Adware. Just download any of the files from the link below and be sure not to install any unwanted additions:
You also have an option to leave a donation for the developer here.