I will link the original mod page on SE once it up and running again.

You are required to have this mod

Better Jumping
Dynamic Animation Replacer

Setting on DoublejumpPlugin.txt (Data\SKSE\Plugins\DoublejumpPlugin.txt)

; Jump count. Set 0 or 1 to disable. -1 for infinite jumps and any other number for that many jumps total.
2
; Requires perk. Set form ID of perk here (including mod index). Example setting 0x5820c would require vanilla "Light Foot" perk from sneak tree.
0
; Limit fall time. If greater than zero then you can't double jump after being in air for this many seconds. Decimal places is ok now.
0
; Allow jump when sprinting. Set 1 to allow and 0 for normal behavior. It doesn't actually make you jump faster, just allows it.
1
; Jump height multiplier for all jumps (always multiplied).
1.0
; Jump height multiplier for second jump (multiplied if second or more jump).
0.7
; Jump height multiplier for sprint jump (multiplied if sprinting and jumping). This also is applied if you start to sprint while in air and doing second jump.
1.0

There.. now all you have to do is unseathed your one handed or two handed weapon, jump and direct your character while pressing jump again.. it should work.
It worked for me.

On the side note from the mod author:

Skyrim.ini:

[havok]
fInAirFallingCharGravityMult=2

You can change the number to test it to your liking/style, but that is my current setting.