# How to Update .pak Chunk Files (without using ChunkDownloader)

**URL:** <https://forums.unrealengine.com/t/how-to-update-pak-chunk-files-without-using-chunkdownloader/1281607>\
**Category:** Platform & Builds\
**Tags:** patch, pak, pak-file, unreal-engine, question\
**Created:** [September 3, 2023, 12:17pm UTC](https://forums.unrealengine.com/t/how-to-update-pak-chunk-files-without-using-chunkdownloader/1281607 "2023-09-03T12:17:58Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ackyshacky](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/ackyshacky/32/600284_2.png) [@ackyshacky](https://forums.unrealengine.com/u/ackyshacky)\
**Post date:** [September 3, 2023, 12:17pm UTC](https://forums.unrealengine.com/t/how-to-update-pak-chunk-files-without-using-chunkdownloader/1281607/1 "2023-09-03T12:17:59Z")

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I am trying to update my .pak files (for version control) myself without using ChunkDownloader. I am creating different chunks, and only want to update the chunks that changed.

But here is the problem. Every time I package the game, the main .pak chunks (such a pak0) change, EVEN THOUGH I DIDN’T CHANGE ANYTHING! So here is the process…

> Package game → I don’t change anything → Package game again → main .pak file sizes change

How do I determine what .pak files really changed? I obviously need to know that, otherwise version control is basically pointless…

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**Author:** ![koraybirand1](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/koraybirand1/32/535974_2.png) [@koraybirand1](https://forums.unrealengine.com/u/koraybirand1)\
**Post date:** [December 27, 2023, 2:05pm UTC](https://forums.unrealengine.com/t/how-to-update-pak-chunk-files-without-using-chunkdownloader/1281607/2 "2023-12-27T14:05:07Z")

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Did you find a solution ?

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**Author:** ![dschertenleib](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@dschertenleib](https://forums.unrealengine.com/u/dschertenleib)\
**Post date:** [May 1, 2024, 8:50pm UTC](https://forums.unrealengine.com/t/how-to-update-pak-chunk-files-without-using-chunkdownloader/1281607/3 "2024-05-01T20:50:54Z")

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I am also interested in this!  
How are we supposed to know which pak chunk is new when they change size?