They are designed to infect your legacy Mac. Enjoy your El Capitan machine safely! Have questions about installing Office on older Macs? Ask in the comments below (but remember to stay safe online).
Finding a version of that runs smoothly on OS X 10.11.6 is a challenge. The latest Microsoft Office 365 and Office 2019/2021 will not install on El Capitan. So, how do you get Office for free on this older system? Microsoft Office For Mac Os X 10.11 6 Free Download
They often inject malware, adware, or ransomware into the PKG file. They are designed to infect your legacy Mac