This is included in my Complete Makeover mod, so if you already have that installed and just use the Dream Weapon in MotB then you do not need to subscribe to this.

After using the console you may want to reenable achievements by editing your save file globals.xml changing the 1 to 0 (zero) in these lines (credit to Aldroen):
<Booleans>
<Boolean>
<Name>ShowCheatsWarning</Name>
<Value>1</Value>
</Boolean>
<Boolean>
<Name>Cheater</Name>
<Value>1</Value>
</Boolean>
</Booleans>

Note that while this is a weapon you get while playing MotB, it can be added through the console to the OC or any other campaign.

When you acquire the dream weapon in MotB the enhanced version will be used. If you have already acquired the dream weapon then as long as you have not changed it to a longsword you should be able to access the additional forms.Otherwise you should drop the bugged sword and then add in the enhanced weapon using the console commands below.

Start the console by typing the "`" key
debugmode 1
giveItem nx1_dream_dagger
debugmode 0
Exit the console by typing the "`" key

To transform the Dream Weapon have the PC or a companion equip it and then activate it. The conversation options will be restricted based on the feats of the activator. Transformation will destroy the initial item form and the new item form will be in the activator's inventory. If the companions are not allowed to converse then the conversation will happen with the main PC but the feats of the weapon wielder will still be used to determine the selectable weapon forms.

After subscribing, navigate to folder C:\Program Files (x86)\Steam\steamapps\workshop\content\2738630\3526816800\override and unzip in place. There should be no need to move the files.