Finally Forklift 4 beta is available. Devs are looking for testers. Looks pretty well so far.
blog.binarynights.com
You can get it here:
Download ForkLift 4 beta 1

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ForkLift 4.2.9 is a quick fix that resolves an issue introduced in version 4.2.8, which prevented dragging items in Icon View.

You can get it here:
Download ForkLift 4 beta 1