I’ve just checked the file and it is fine.
The SHA-256 is ca19471e10660765dec12c980ebd3eeb9b82826ea4f25bc490936f312b14caff
and the file size is 20248056 bytes.
Try clearing your web browser cache and download it again.
Above Audacity 2.2.2 installer (19.31 MB, includes help files), it says
“Left-click the text link to start the download. Right-click and “Save as…” will not work.”
Ugh, I messed up and did not follow instructions correctly since I use a left handed mouse so forgot everything is reversed.
What happens is that “Save as…” downloads a file named “audacity-win-2.2.2.exe” which is only 253 KB size. Unclear why this file is downloaded.
When I “Left-click (right-click with left handed mouse) the text link to start the download.”, it downloads the correct sized file with correct SHA256.