As KCC has stated to my friend over the phone and in an email which I will copy underneath and high light te part which is important.
Thank you for your inquiry.
If you are in the United States, you may be eligible to apply to the Citizenship and Immigration Services (CIS) for adjustment of status. The option to adjust status may no longer be available to all applicants. To determine whether you are eligible to adjust your status you MUST contact the CIS. Once the CIS confirms your eligibility to adjust status they will provide you with the additional information that you need. When contacting your local CIS office they may inform you that you will not be eligible to file your adjustment until your case number is current and available for processing. Please refer to the visa bulletin at
www.travel.state.gov to view the current case numbers being processed. This bulletin is updated after the 15th day of each month.
If the CIS determines that you are eligible to adjust status you will be required to pay a non-refundable diversity-processing fee of $375.00 per person directly to the Department of State once your adjustment until your case number is current and available for processing. Information regarding where this fee should be paid is included in your information packet. This fee is assessed to cover cost incurred by the Department of State in running the lottery selection process and is separate from any fees you will need to pay the CIS as part of your adjustment application. Failure to pay this fee may result in the loss of your diversity visa. (Please mail a money order for the diversity-processing fees to the address given below.) Also, please forward the completed DSP-122 form back to KCC. This will allow the next instruction letter to be processed to you.
Over the phone they clearly stated to wait till your number is current which might be August 15th, the KCC employee stated, but it depends on your number...till than you only have to send the required papers to KCC. The second NL has nothing to with your $ 375.- payment but with the papers that has been send to KCC, so wait till you get that letter, but you can also do as you want, but as the KCC person stated...the $ 375.- isn't refundable.