If you must need to use 1.54.1 or below for the short term (e.g you have a release upcoming etc) you can patch the engine to add the necessary WASM module
Example here where the patch file is set to load after the engine:
https://playcanvas.com/project/1041687/overview/roll-a-ball-1541-test
This is not recommended for the long term, just to over a near term hump.
As Martin said above, we recommend that the project is updated as soom as possible to use the current stable version.