The safest and most professional route is to buy the official PDF from the ASHRAE Bookstore (www.ashrae.org). As of 2025, the current version is (with possible addenda). Cost is typically $99–$150 for members, $150–$200 for non-members.
If you have an old 2016 PDF, throw it away. The 2022 update changed the game: ashrae 90.4 pdf
Some jurisdictions (e.g., the U.S. Green Building Council or specific state energy offices) host "read-only" versions for reference. However, these are usually watermarked and not printable. The safest and most professional route is to
The MLC allowance can be very tight for small facilities because overhead doesn't scale linearly. Solution: The standard allows a "simplified approach" using packaged equipment with listed efficiencies. ashrae 90.4 pdf