About a week ago I received an email from D-Link with new instructions and a file to use to upgrade the firmware. This worked. The device now reports the following:
Firmware External Version: V1.22
Firmware Internal Version: V1.22b06
Date: Wed, 3 Feb 2016
Checksum: 0x06565C77
2.4GHz regulation domain: NA
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
Firmware Query: http://wrpd.dlink.com/router/firmware/query.aspx?model=DCH-S150_Ax_Default_FW_0122_C412F5DB46DF
LAN MAC: C4:12:F5:DB:46:DF
Kernel: 2.6.31, B0031, Date=Fri, 17 Jul, 2015
Apps: 1.1, B0141, Date=Wed, 03 Feb, 2016
WLAN Driver: AR9531, 10.1.478, B0011, Date=Wed, 9 Dec, 2015
2.4GHz WLAN MAC 0: C4:12:F5:DB:46:DF
2.4GHz SSID: DCH-S150-46DF
Factory Default: 0
DCH_ID: bbf721d835a3443c6e1f9865823960ab
When the device detects motion, I get a nearly instantaneous alert on my cell phone, which was all I was looking for.