Download and install these three updates offline (in this order):
Because Microsoft no longer hosts the files, you must use verified community resources or official OEM channels. Below are the three safest methods.
If your only goal is to run specific legacy software, consider these safer alternatives before diving into a decade-old OS.
Use (free, open-source). Do not use Microsoft’s Media Creation Tool (it no longer works for Win7).
After these reboots, Windows Update will find hundreds of updates. Prepare for a 4–6 hour update cycle.