Any Hair Any Mesh - Hair Utilities
What do you mean by (Now it can transfer hairs while keeping old hairs (Note- It needs you to select one extra mesh to avoid artifacts)
This is what I meant by extra mesh. If you want to transfer hairs to only one mesh then select two meshes and If you want to transfer hairs to two meshes then select three meshes. 
How to access all the tools?
Just use the search option in the 3d view.
What I can do with the Commercial version?
You can do everything shown in the description.
What I can do with the Standard version?
You transfer hairs in one click. You only need to match transform by yourself.
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