my minecraft crashes overtime i go on cosmicpvp.com on fallout planet

plz help me out

Thank you for your report!
However, this issue has been closed as Invalid.

Your Minecraft version is outdated. We currently take issues for version 1.10.2 and the latest snapshot.
Please update to the latest version as it includes the newest fixes. If you still have this problem after updating, then please create a new issue.
In case of a game crash, please also attach the crashlog.

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how do i update to the latest version?

because cosmicpvp.com is only 1.9 and 1.8.9

Minecraft Crash Report ----
// My bad.

Time: 10/28/16 10:19 AM
Description: Tesselating block model

java.nio.BufferOverflowException
at java.nio.DirectIntBufferU.put(DirectIntBufferU.java:363)
at java.nio.IntBuffer.put(IntBuffer.java:859)
at bfd.a(SourceFile:400)
at bgf.a(SourceFile:255)
at bgf.b(SourceFile:113)
at bgf.a(SourceFile:47)
at bgf.a(SourceFile:37)
at bgd.a(SourceFile:62)
at bht.b(SourceFile:176)
at bhp.a(SourceFile:78)
at bho.b(SourceFile:121)
at bfr.a(SourceFile:842)
at bfk.a(SourceFile:1215)
at bfk.b(SourceFile:1149)
at bfk.a(SourceFile:1002)
at ave.av(SourceFile:915)
at ave.a(SourceFile:325)
at net.minecraft.client.main.Main.main(SourceFile:124)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

– Head –
Stacktrace:
at java.nio.DirectIntBufferU.put(DirectIntBufferU.java:363)
at java.nio.IntBuffer.put(IntBuffer.java:859)
at bfd.a(SourceFile:400)
at bgf.a(SourceFile:255)
at bgf.b(SourceFile:113)

– Block model being tesselated –
Details:
Block: minecraft:tripwire[attached=false,disarmed=false,east=false,north=false,powered=false,south=false,suspended=true,west=false]
Block location: World: (13394,68,-4915), Chunk: (at 2,4,13 in 837,-308; contains blocks 13392,0,-4928 to 13407,255,-4913), Region: (26,-10; contains chunks 832,-320 to 863,-289, blocks 13312,0,-5120 to 13823,255,-4609)
Using AO: false
Stacktrace:
at bgf.a(SourceFile:47)
at bgf.a(SourceFile:37)

– Block being tesselated –
Details:
Block type: ID #132 (tile.tripWire // aki)
Block data value: 2 / 0x2 / 0b0010
Block location: World: (13394,68,-4915), Chunk: (at 2,4,13 in 837,-308; contains blocks 13392,0,-4928 to 13407,255,-4913), Region: (26,-10; contains chunks 832,-320 to 863,-289, blocks 13312,0,-5120 to 13823,255,-4609)
Stacktrace:
at bgd.a(SourceFile:62)
at bht.b(SourceFile:176)
at bhp.a(SourceFile:78)
at bho.b(SourceFile:121)
at bfr.a(SourceFile:842)
at bfk.a(SourceFile:1215)
at bfk.b(SourceFile:1149)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bew['OLD_SAVAGE'/3230, l='MpServer', x=13420.76, y=60.34, z=-4930.00]]
Chunk stats: MultiplayerChunkCache: 10, 10
Level seed: 0
Level generator: ID 02 - largeBiomes, ver 0. Features enabled: false
Level generator options:
Level spawn location: 1654.00,17.00,-1117.00 - World: (1654,17,-1117), Chunk: (at 6,1,3 in 103,-70; contains blocks 1648,0,-1120 to 1663,255,-1105), Region: (3,-3; contains chunks 96,-96 to 127,-65, blocks 1536,0,-1536 to 2047,255,-1025)
Level time: 226727057 game time, 84000 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 1 total; [bew['OLD_SAVAGE'/3230, l='MpServer', x=13420.76, y=60.34, z=-4930.00]]
Retry entities: 0 total; []
Server brand: CompilexSpigot
Server type: Non-integrated multiplayer server
Stacktrace:
at bdb.a(SourceFile:309)
at ave.b(SourceFile:2311)
at ave.a(SourceFile:334)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.8.9
Operating System: Mac OS X (x86_64) version 10.11.6
Java Version: 1.8.0_74, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 151483336 bytes (144 MB) / 266694656 bytes (254 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 99
Launched Version: 1.8.9
LWJGL: 2.9.2
OpenGL: AMD Radeon HD 6750M OpenGL Engine GL version 2.1 ATI-1.42.15, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 8x Intel(R) Core(TM) i7-2720QM CPU @ 2.20GHz

2 possible solutions:
1: Ask the server owners to update
2: Find an updated server.

Old versions will not be updated anymore.