My Minecraft launcher says that it is in an older version of the launcher and says: "You are running an old version of the launcher. Please consider using the new launcher which will improve the performance of both launcher and game.
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This notice means that your version of the launcher won't be able to autoupdate, or that you're manually launching the jar instead of the exe. Consider getting the latest Minecraft installer and then launching the game from Minecraft.exe, and you hopefully shouldn't be seeing this.
Don't delete anything. Simply download the installation from https://minecraft.net/en-us/download/, install it and run it.
Please contact the community support, linked below.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki
Sorry Kumasasa for making multiple issues it's just it wasn't getting noticed and getting shoved down in the comments.