There is this issue on github (among several other duplicate complaints): https://github.com/ethereum/web3.js/issues/2623.
There is also this stack question: How can the web3 library be imported in a web application?. Unfortunately, this answer only provides how to inject beta 37 (which for whatever reason is also now version 1.2). Beta 37 doesn't work for what I am doing, I need Beta 55. How do I acquire this version in a minified form for browser injection?
Edit: Link to github for Beta 55 branch is dead. https://github.com/ethereum/web3.js/tree/v1.0.0-beta.55/dist