Considering library org.ow2.asm:asm-commons:9.1 File exists: Checksum validated. Considering library org.ow2.asm:asm-tree:9.1 File exists: Checksum validated ...
About the custom launcher, you should be able to use it if you can point it to a different .minecraft directory. I'm using TLauncher for its own preinstalled Forge and Fabric mods. And I added this ...
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