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Installing Rosepad into MultiMC

Create a new instance with version a1.1.0 (you might need to check "Alphas" checkbox)
Open instance editor
In "Version" tab, click "Replace Minecraft.jar" and find Rosepad jar in the opened prompt
Downgrade LWJGL to 2.9.1
In "Settings" tab set "Java installation" to the Java 8 Home
Add -Djava.util.Arrays.useLegacyMergeSort=true JVM argument
Launch the game