Running a 2011 software suite in 2021 presented several hurdles:

If you are specifically using , the following legacy versions are your only options for local installation:

The pressing question at the time (and still for archival purposes) was:

Keep a copy of Office_2011_14.7.7.dmg and your product key. It remains a masterpiece of software compatibility — one of the longest-supported Office suites for a single macOS version. But as of 2021, it is a museum piece.