Will follow up on this to share some of the things I’ve found.
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butler by itch.io - Thanks @Stranger on Discord for the reco. Mentioned that it’s pretty reliable, generates small patches and applies them quite quickly
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GitHub - TheCrafters001/Easy-Butler: Easy Butler; updating your games just got easier!
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GitHub - JunoWorks/JunoPatcher: Open source patcher for Ragnarok Online - Used for Ragnarok Online, hasn’t been updated in 3 years
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GitHub - TheZoc/ZPatcher: A suite to Create and Apply patches to application and games. - ZPatcher. Was updated last year so while not super active it’s at least been maintained a bit more recently. More info here: https://forums.unrealengine.com/comm…e-updater-tool
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GitHub - amireh/Karazeh: Karazeh is a library for patching desktop software, suitable for use as a - cross-platform tool for patching and launching desktop applications, is meant to be used with Kiwi, the tool that generates the patch scripts which Karazeh consumes
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DQ Patcher: https://assetstore.unity.com/package…-patcher-11529 built by these guys http://www.dqteam.com . Dont’ mind the unity store link this tool is engine agnostic as we can attest to as we currently use it on our UE4 project.
Unilan - Browse Files at SourceForge.net - Seems geared towards Unity but could be a good ref.