To install the DLC for smash, you must first install the latest game update. This update contains all the DLC, and the DLC cia is simply a key that unlocks it.

Basically the dlc cia can't function without the update data. It'll reject to install the dlc cia as long as there's no game update data installed yet.

 

I'm having the same problem. Latest update and the Cloud CIA won't install.

 

Have you initialized /dbs/ yet? You need to do that or .cia installation will not work.

I hear visiting eShop is a fine alternative for O3DS, too.

 

To quote the tutorial here:
https://gbatemp.net/threads/wip-complete-custom-firmware-guide.396349/

• Navigate to the \Nintendo 3DS folder on the microSD and open the folder that's all numbers and letters. Inside will be another folder that's all numbers and letters. Open that and you will see a folder called \extdata.
• Create a new folder called \dbs there, next to the folder called \extdata. Put the two files that came in dbs.zip, called import.db and title.db, into the \dbs folder.
• Don't do this if you already have a \dbs folder containing import.db and title.db in there!
• ... Start your 3DS, go to System Settings, Data Management, Nintendo 3DS, Software. It will show a warning that the database files are corrupt and need to be rebuilt. Do this and exit System settings.
• • Without this, FBI won't start thus you will not be able to install .cia files. You will also need to do this after you setup EmuNAND and unlink, so keep this in mind.

 

I'm... actually not sure! Try and see if it fixes, I guess. If you already have a /dbs/ folder, then disregard what I've said: If that's the case, this isn't the solution for you.

 

If you replace it while it exists, then yes it will. If the /dbs/ folder does not exist for you, then that is the reason why it isn't working.

 

Checked rn.
2nd folder inside nin3ds (emunand)have dbs.
gtg

 

Yes I have cloud and Lucas
But someone else didnt have any problem..
That guy also had dlc

 

In data management?

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I think dlc doesnt cause problems, it says invalid cia when I try to install.
Maybe something is wrong with cia probs i guess