July 2, 20223 yr there are 2 things which are existential: you have the permission of the mod author to do this you know basic java You also need to know that 1.16.5 will be fall out of support in a few days so I would recommend you to update to 1.18.2 or 1.19 Now to the update there are a lot of changes in minecraft and forge so there is no easy way to update a Mod, you can just create a new Mod and then try to move/recreate each feature of the Mod on the new version you can take a look at this: https://docs.minecraftforge.net/en/latest/legacy/porting/
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