Can I install 1.14 and 1.15 Minecraft on Windows 10 at same time?

Java is on 1.15 now. Bedrock 1.14 is Beta. 1.12 is general public.

On what system are you playing Minecraft?

Sony pushed an update for Minecraft on Playstation 4 to update it to the "Bedrock" version, allowing Playstation 4 players to play with Xbox One, PC, Mobile and Switch users now.

Make sure you also have Version 1.14 of your Minecraft installed, and that you are playing on Xbox One, Switch, Playstation 4, Windows 10 or Android/iOS.

Minecraft on Xbox 360, Nintendo 3DS, and other "older" console versions can't play with others on the "Bedrock" version.

03-13-2020 and still no 1.15 update for windows 10 version.

I see that Java edition is up todate.. Anyone know if this is gooing to get fixed?

I am not an expert, and I have the same problem. I first bought the "Minecraft: Java Edition", I wanted to use the redeem code to get "Minecraft for Windows 10", so I clicked "Redeem", I got the code, but when I entered it, it said "The code has already
been redeemed.", I checked my order history, it said that I had bought "Minecraft for Windows 10" using the code, but when I clicked install, it keeps showing me a small window with my code. I then checked whether if the account/email on Mojang, Minecraft.net,
and Microsoft Store, it was the same. So I don't get why I can't install "Minecraft for Window 10".

Version 1.12.1 is the currently the most recent official version of Minecraft in the Bedrock edition.

If you (or your friends) have opted in to receive the Beta version of Minecraft, then you'd be at version 1.14.

So unless you actively used the Insider program to opt in to the Minecraft Beta, the 1.12 version is the most up to date version, and everything is as it should be.

If you want to play with friends that have 1.14, they either have to leave the Beta, or you'll have to join the Beta to get 1.14. But be aware, that using Beta versions, you are playing on untested software, which can cause unexpected crashes or data loss.