Hello everyone! We're happy to announce that GModPatchTool, our rewrite of GModCEFCodecFix in Rust, is now out of beta!
In case you missed it, the new GModPatchTool brings significantly better download AND patching performance, addresses issues with the old tool's recurring downtime after GMod updates ("Failed to match Original Checksum"), and most critically makes antivirus false-positives much less likely!
This is a breaking change with the old GModCEFCodecFix tool.
The old tool is no longer functional and you will need to update to the new GModPatchTool to continue applying our patches. Trying to use the old tool will only result in a warning telling you you need to update, followed by a 404 error.
If you run into any issues using the new tool, please let us know in our Discord's #gmodpatchtool channel or in our GitHub Issues!
github.com
https://github.com/solsticegamestudios/GModPatchTool/tree/files/symbols
You can use the minidump-stackwalk tool to analyze crash dumps using them.
If you don't know what any of that means, it's not for you.
The old tool has been suffering from the "Failed to match Original Checksum" error significantly more lately due to us trying to reduce the cost of hosting the tool.
The new tool is not affected nearly to the same degree, and costs us significantly less to operate, so this stable release is happening earlier than expected.
This means that for Windows users, Cinema (Fixed Edition) and Media Player (Updated Edition) (partially, mostly just YouTube) work out of the box without any patches or betas once again!
A special thank you to @ShadowSun™, the developer of the Fixed/Updated Editions, for making them compatible, and obviously Facepunch/Rubat for finally taking this step in the right direction. We hope to see 64-bit and support for CEF on other operating systems follow shortly.
That said, we do still recommend the x86-64 beta with GModPatchTool for the best experience/media support.
solsticegamestudios.com
We're working to update the Visual Install Guides soon, if you prefer that.
We also added a little indicator for when you're patched:
And again, a very special thank you to Swamp Servers for sponsoring development of this rewrite...
...@JohnPeel and @Akiko for contributing code/testing for this rewrite
...And all of our Donators and Supporters! If you find/found this tool useful, please consider donating a few dollars to help support it!
www.solsticegamestudios.com
Love You All!
In case you missed it, the new GModPatchTool brings significantly better download AND patching performance, addresses issues with the old tool's recurring downtime after GMod updates ("Failed to match Original Checksum"), and most critically makes antivirus false-positives much less likely!
Important
This is a breaking change with the old GModCEFCodecFix tool.The old tool is no longer functional and you will need to update to the new GModPatchTool to continue applying our patches. Trying to use the old tool will only result in a warning telling you you need to update, followed by a 404 error.
If you run into any issues using the new tool, please let us know in our Discord's #gmodpatchtool channel or in our GitHub Issues!
GModPatchTool Download
You can get the Latest Release here:Release November 2nd, 2025 · solsticegamestudios/GModPatchTool
Since the Last Release Patch: Add better HTTP error handling (also falls back to the backup web server in more scenarios) (should fix #185 and #213) Patch: Create the PID lockfile in the OS cache ...
github.com
Developer Debug Symbols
Breakpad Debug Symbols are now also available for developers who wish to debug crashes with GMod/CEF while using our patches:https://github.com/solsticegamestudios/GModPatchTool/tree/files/symbols
You can use the minidump-stackwalk tool to analyze crash dumps using them.
If you don't know what any of that means, it's not for you.
GUI
I know we said that a future GModPatchTool beta would have full support for the GUI, but it's still some time away, so we decided to postpone that to get you all a working stable release.The old tool has been suffering from the "Failed to match Original Checksum" error significantly more lately due to us trying to reduce the cost of hosting the tool.
The new tool is not affected nearly to the same degree, and costs us significantly less to operate, so this stable release is happening earlier than expected.
State of Cinema / CEF
Something else I would like to mention as well is that CEF has officially made it to the main (no beta) branch of GMod on Windows!This means that for Windows users, Cinema (Fixed Edition) and Media Player (Updated Edition) (partially, mostly just YouTube) work out of the box without any patches or betas once again!
A special thank you to @ShadowSun™, the developer of the Fixed/Updated Editions, for making them compatible, and obviously Facepunch/Rubat for finally taking this step in the right direction. We hope to see 64-bit and support for CEF on other operating systems follow shortly.
That said, we do still recommend the x86-64 beta with GModPatchTool for the best experience/media support.
Official Guide Updated
In case you need a refresher, our Official Install Guide for the x86-64 beta and GModPatchTool has been updated:
Fix Media | Solstice Game Studios
Guide for installing x86-64 and GModPatchTool for Garry's Mod.
solsticegamestudios.com
We're working to update the Visual Install Guides soon, if you prefer that.
We also added a little indicator for when you're patched:
Thank You
And again, a very special thank you to Swamp Servers for sponsoring development of this rewrite... ...@JohnPeel and @Akiko for contributing code/testing for this rewrite ...And all of our Donators and Supporters! If you find/found this tool useful, please consider donating a few dollars to help support it!
Donate | Solstice Game Studios
Help us pay for the operating costs of Solstice Game Studios, its developers, and the projects we run!
www.solsticegamestudios.com
Love You All!
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