Pressing create ncchinfo.bin doesnt create a fileCheck the last page or so of Decrypt9 and download the latest zip file. That can let you convert .3ds to .cia with just your 3DS. If you don't want to go that route, use Decrypt9 through your Decrypt9 Luma payload and use this:
1) Put your 3DS roms in the roms folder of zip file after extracting it.
2) Press "Create ncchinfo.bin file".
3) Move that ncchinfo.bin file to the Decrypt9 folder that should be on the root of your SD card.
4) Put your SD card back into your system and open Decrypt9 through your payload.
5) Go to XORpad Generator Options -> NCCH Padgen and let that do what it needs to do.
6) After that's done, unmount your SD card and move all of the .xorpads to the xorpad folder that was in the Simple CIA Converter zip.
7) Hit the Convert 3DS to CIA and select the folder that your ROMs are in.
8) The program will then convert them. If the program freezes or says it's unresponsive, don't panic. That's normal.
9) Put your newly generated CIAs onto your SD card and install them with FBI.