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Call or email us for friendly customer care and free tech support.

McMillan Study Guides, Inc. 265 South St., Suite B
San Luis Obispo, CA 93401
Phone: 800.821.1338 or 805.545.0112 Hours: 9 am – noon, 1 – 4 pm PT, M–F

Customer Care

Top 5 FAQs

I lost my software serial number.

Sign in to your online account via My McMillan. If you activated your software, your serial number will appear under "My Study Guides."

If you purchased your software direct from McMillan, you may also find your serial number under "My Order History" -- locate your order and click "View Details."

Can I get a discount on the AFH 1 Suite app if I already purchased GOLD or Advisor?

No. Since our apps are sold directly through iTunes or Google Play we are unable to offer discounts.

AFH 1 Suite app for Android requires OS 4.0 and up.

AFH 1 Suite app for iOS requires OS 6.0 and up.

Do you offer NCO DLC or SNCO DLC?

Our brand new NCOA courses are in the works. Sign up to be notified as soon as they’re ready. The text of these courses is not included in our study guides.


We’re hoping to offer SNCOA soon. Visit CDC Central to help us get them started.

I receive the error "The application could not be installed because the installer file is damaged..."

Generally this error message is related to McAfee Antivirus blocking the installation of our program. If you are running McAfee, temporarily turn OFF "Real-Time Scanning" and try running our software installation again.

NOTE: Simply disabling McAfee from the task bar is not sufficient.

If your McAfee is expired or you do not intend to use McAfee, you must completely uninstall McAfee and then restart your computer.

If this solution doesn't work or you are not using McAfee, please contact Technical Support.

I'm an SNCO and don't need to test anymore. Can I get a refund?

On February 4, 2019, the Air Force announced it was removing the WAPS testing requirement for active-duty promotions to the grades of E-7 through E-9, beginning with the 19E9 promotion cycle.


As has long been in keeping with our return policy, we are unable to offer refunds on activated/used studyware. All of our SNCO guides are listed as "All Sales Final." If your studyware has not been accessed, please contact Customer Care so we may look into your order further.

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