1.20.1 Trying to install forge 1.20.1 and I'm getting Failed to run processor: java.io.EOFException:Unexpected end of ZLIB input stream

[Hazardous Potato]

When i try to install forge 1.20.1 I get the error in the description. I am using an M2 macbook pro if that helps, also i gave the log files for both the recommended and latest, i couldn't figure out how to upload the file, so thats why i'm giving 2 google doc links:

Latest:

https://docs.google.com/document/d/1w8XphCjgTD2SGiUNNWFcyaIJBRgYiKFpvUX_Mmp7Co8/edit?usp=sharing

Recommended:

https://docs.google.com/document/d/10w-AiyLPuL_gq_WvYiIUm5HSsX9o7gtCwkg9v9ZepkQ/edit?usp=sharing

[warjort]

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java.io.EOFException: Unexpected end of ZLIB input stream

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The zlib error message says the file is "truncated", i.e. it probably didn't fully download.

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JVM info: Oracle Corporation - 1.8.0_391 - 25.391-b13

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It shouldn't make any difference for the insall? But you will need java 17 to run minecraft 1.20

[Hazardous Potato]

I tried installing it multiple times, each time i got that same error

[warjort]

Here's how somebody else fixed a similar problem today.

https://forums.minecraftforge.net/topic/141592-problem-when-installing-forge-1171-client-side-mac/#comment-561476

Their problem was the original vanilla minecraft download was corrupted (hadn't finished downloading properly).

Your log shows a similar problem (mismatched checksums):

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Cache: 

    /Users/sterlingrussell/Library/Application Support/minecraft/libraries/net/minecraft/client/1.20.1-20230612.114412/client-1.20.1-20230612.114412-slim.jar

      Expected: de86b035d2da0f78940796bb95c39a932ed84834

      Actual:   2fc4e8fe00b06689e26c059790924656b4db2bed

    /Users/sterlingrussell/Library/Application Support/minecraft/libraries/net/minecraft/client/1.20.1-20230612.114412/client-1.20.1-20230612.114412-extra.jar

      Expected: 8c5a95cbce940cfdb304376ae9fea47968d02587

      Actual:   c74e0edcd9e2589b53b9f4d3841198e300771fb5

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You can find the vanilla installs in the "versions" subfolder of your minecraft folder.

e.g.  from your log above: /Users/sterlingrussell/Library/Application Support/minecraft/versions/1.20.1/1.20.1.jar

Edited December 30, 2023 by warjort

[Hazardous Potato]

so delete the directory or jus the file?

[Hazardous Potato]

deleted all the 1.20.1 directories in the versions folder and it installed, thanks!