Out of nostalgia I wanted to play MC 1.5.2 again. But when I start it it crashes every time:
Here is the log.
Hope to answer.
Have you already reinstalled it?
I've had the problem too. Most of the time it helps to delete it and then download it again, but first save the edited maps as a file on icloud or ka where.
Somehow it's down to the launcher. It works with https://multimc.org/.
Minecraft already crashes on 1.7.10 for me.
It could be the launcher. The version is now very old. But there are also alternative launchers.
e.g. MultiMC