There is a new pull request by daerich against master on the void-packages repository

https://github.com/daerich/void-packages multimc6-14
https://github.com/void-linux/void-packages/pull/34495

MultiMC: update to 0.6.14
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#### Testing the changes
- I tested the changes in this PR: **YES**
Unfortunately upstream changed quite some things on how to reliably acquire this package - partly due to new licensing terms.
Also the way has been paved for installscripts geared towards "popular" distributions(Ubuntu/Fedora). They now only deploy a downloader to embed the package in the users home directory.
So meld the generic Linux binary with the Ubuntu recreating the prior Void distribution of this package(Icons and .desktop are part of the Ubuntu package and can't be hosted elsewhere).
This all is necessary due to a certain company from Redmond, WA forcing Minecraft onto their infrastructure.
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A patch file from https://github.com/void-linux/void-packages/pull/34495.patch is attached