It seems to be fixed now, but i will tell you if it happens again (i will remove this message)

I cannot play older versions. They crash on bootup. And before you say "OmG wE dOnT sUpPoRt OlDeR vErSiOnS", it happens on all older versions. They all worked before, and I have no idea what happend. I have tried reinstalling the launcher.

For example, here is a crash report for when I try to open 1.5.2:

---- Minecraft Crash Report -------- Minecraft Crash Report ----// My bad.
Time: 1/31/21 8:35 PMDescription: Failed to start game
java.lang.NullPointerException at java.io.Reader.<init>(Reader.java:78) at java.io.InputStreamReader.<init>(InputStreamReader.java:97) at bp.a(SourceFile:64) at bp.a(SourceFile:100) at net.minecraft.client.Minecraft.a(SourceFile:252) at avv.a(SourceFile:56) at net.minecraft.client.Minecraft.run(SourceFile:507) at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– System Details --Details: Minecraft Version: 1.5.2 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 100343256 bytes (95 MB) / 134217728 bytes (128 MB) up to 2147483648 bytes (2048 MB) JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used Suspicious classes: No suspicious classes found. IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0 LWJGL: 2.9.0 OpenGL: Intel(R) UHD Graphics 620 GL version 4.6.0 - Build 27.20.100.8681, Intel Is Modded: Very likely; Jar signature invalidated Type: Client (map_client.txt) Texture Pack: Default Profiler Position: N/A (disabled) Vec3 Pool Size: ~_ERROR~ NullPointerException: null

Also I don't have a modded version of the game, I don't know why it thinks I do.

This pretty much happens on practically any old version. Please fix.

EDIT: When I switch between older versions, it says this in debug: "TIMER: Downloads took 0 seconds.". It's saying that it took 0 seconds to download which should be impossible.