: Using older, unsupported software like version 9 poses security risks, as it does not receive patches for modern vulnerabilities.
: Sites like PDFescape or iLovePDF allow for quick, browser-based edits without installing software. Nitro pro 9 gratis
While there is no permanent free version, Nitro offers a way to test their (Nitro Pro 14) at no cost: : Using older, unsupported software like version 9