Here's the procedure outlined by Kevin, as an edited quote, derived from several of his messages:
"Came across a work around which I hope will keep working come June 1st.
You need to go into your Google account and it is under Security. Turn on "2 Step Authentication" for each Gmail account and then add an App Password for WLM. You just need to generate the App Password from Google Security and then use that when you update your email ie send/ receive in your WLM. When you update your email ie send/ receive in WLM it will prompt you for this password instead of your Gmail password. The option to turn on/off Less Secure Apps in my security settings disappeared once I turned on 2 Step Authentication."
And here's the link to the YouTube video which provides the same procedure, one that has worked for a lot of us: https://www.youtube.com/watch?v=D-SqaEmSjAc
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As a matter of fact, one additional YouTube video has also sprung up which provides the same solution. That one is at https://www.youtube.com/watch?v=yKLZBNlhrQs
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The previous version of this message also linked to a third video which I thought MIGHT also have a good solution but IT DID NOT. Which is why I've removed that third link. Specifically, you can NO LONGER ACCESS GMAIL if you are using the Less Secure Apps option in the Gmail security settings. Sorry about that.