Fixed it! Here's what I did.
Mac:
I ran Disk Utility to see if I had issues, and I did. So I watched this and it fixed all issues - https://www.youtube.com/watch?v=ZQ42-84SeYI&t=1s

Then I fixed Java with this -
https://www.oracle.com/technetwork/java/javase/downloads/jdk12-downloads-5295953.html

Then I watched the video carefully and did everything. At 8:06 you can copy the location. Then open Minecraft. Go to launch options, click on the first line, turn on the JAVA and paste text in box and SAVE. And reload and it worked! 🙂 I hope that helps. All the best.

Fixed it! Here's what I did.
Mac:
I ran Disk Utility to see if I had issues, and I did. So I watched this and it fixed all issues - https://www.youtube.com/watch?v=ZQ42-84SeYI&t=1s

Then I fixed Java with this -
https://www.oracle.com/technetwork/java/javase/downloads/jdk12-downloads-5295953.html

Then I watched the video carefully and did everything. At 8:06 you can copy the location. Then open Minecraft. Go to launch options, click on the first line, turn on the JAVA and paste text in box and SAVE. And reload and it worked! 🙂 I hope that helps. All the best.

Fixed it! Here's what I did.
Mac:
I ran Disk Utility to see if I had issues, and I did. So I watched this and it fixed all issues - https://www.youtube.com/watch?v=ZQ42-84SeYI&t=1s

Then I fixed Java with this -
https://www.oracle.com/technetwork/java/javase/downloads/jdk12-downloads-5295953.html

Then I watched the video carefully and did everything. At 8:06 you can copy the location. Then open Minecraft. Go to launch options, click on the first line, turn on the JAVA and paste text in box and SAVE. And reload and it worked! 🙂 I hope that helps. All the best.

Fixed it! Here's what I did.
Mac:
I ran Disk Utility to see if I had issues, and I did. So I watched this and it fixed all issues - https://www.youtube.com/watch?v=ZQ42-84SeYI&t=1s

Then I fixed Java with this -
https://www.oracle.com/technetwork/java/javase/downloads/jdk12-downloads-5295953.html

Then I watched the video carefully and did everything. At 8:06 you can copy the location. Then open Minecraft. Go to launch options, click on the first line, turn on the JAVA and paste text in box and SAVE. And reload and it worked! 🙂 I hope that helps. All the best.

Fixed it! Here's what I did.
Mac:
I ran Disk Utility to see if I had issues, and I did. So I watched this and it fixed all issues - https://www.youtube.com/watch?v=ZQ42-84SeYI&t=1s

Then I fixed Java with this -
https://www.oracle.com/technetwork/java/javase/downloads/jdk12-downloads-5295953.html

Then I watched the video carefully and did everything. At 8:06 you can copy the location. Then open Minecraft. Go to launch options, click on the first line, turn on the JAVA and paste text in box and SAVE. And reload and it worked! 🙂 I hope that helps. All the best.

Obviously, they do NOT take these comments seriously. I posted this looking for answers and instead of getting this resolved, I'm told to go to community support. I didn't have this issue until I did the stupid update! And now it doesn't work. Bug or system issue, they should fix this. 

I've reboot my system. I've updated Java, I've tried clicking on reset java (useless), I've tried reloading the game, I've tried looking at launch options, I've tried to find the boot log on MAC (which I'm don't know how to do), I've sent screen shots, I've asked others, I've scanned through countless YouTube videos and Google articles but only found people who have the same issue or something similar but NO ANSWERS! This was my very last hope to finding help. And now I'm told to go to the community. This tells me that the Mojang Gods don't have the answer either. So my fellow frustrated, pissed off card carrying Minecrafters, we are tossed back to square one. I wish you all well. And if ANYONE finds a resolution to this issue, please post it loud and clear! Thank you! 

So, is anyone from Mojang watching this thread? I haven't read any information on how to fix the issue. I believe I've sent in everything I could find. Now what?!

I've not changed anything. I just did the update. And since then, it won't work and I have a very sad little boy. It's difficult to tell him that he can't play and it's been a couple of months now. I wish they could come up with a patch or another update.

Exactly! I tried once and I thought it was going to load but just at the end, nope.

It doesn't open. The 'last open' date is that I tried to open the game and it didn't load. Please help me fix this. 

I can't find: launcher_log.txt.

Nothing. It takes me back to the play button. I click on play again and that window comes up again. I have a MAC and I don't know how to access Minecraft files with it. I've tried. I've also tried to reinstall the game but I get the same message. And when I click on more details I get: 

ERROR 😞

Unable to locate the Java runtime.
Filename on disk:
Path: .
Exists: directory
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I'm having the same issue. It's been very frustrating. The kids are upset and it's been two weeks.