[HTC One A9] nenebear:
Error message is and ruu.zip relationship. But I am a confirmed downloaded 1.10.401.7.zip can flash no problem. So the remaining two possibilities

1. You use fastboot

2. Your A9

I extracted partial.zip and images you can try again.

This is to provide a way to solve your problem. But if thus hurt your own risk devices themselves. I've tested is OK for me.

Please in twrp backup first.

download :

HTC_A9_1.10.401.7_partial.zip

HTC_A9_1.10.401.7_Images_OTA.rar

flash partial (twice)

E:\HTC_A9\401>adb reboot oem-78

E:\HTC_A9\401>fastboot flash zip HTC_A9_1.10.401.7_partial.zip
htc_fastboot v3.0.9.2 (2015-05-29)
target reported max download size of 800000000 bytes
sending 'zip' (88062 KB)...
OKAY [ 6.562s]
writing 'zip'...
(bootloader) HOSD CL#656287
(bootloader) GPT is up-to-dated. [17408]
(bootloader) Perform pre-update
(bootloader) start@25
(bootloader) modemst1.img@BYPASS
(bootloader) modemst2.img@BYPASS
(bootloader) pg2fs_ship_signkey.img@BYPASS
(bootloader) rcdata.img@BYPASS
(bootloader) recovery_signed.img@BYPASS
(bootloader) rfg_3.img@BYPASS
(bootloader) rpm-8952-1.img@100%
(bootloader) sbl1-8952-1.img@100%
(bootloader) sensor_hub.img@BYPASS
(bootloader) splash1.nb0@BYPASS
(bootloader) tp_SYN3708.img@BYPASS
(bootloader) tz-8952-1.img@100%
(bootloader) wcnss.img@BYPASS
(bootloader) aboot_signed.img@100%
(bootloader) adsp.img@BYPASS
(bootloader) apppreload.img@BYPASS
(bootloader) cmnlib32.img@100%
(bootloader) cota.img@BYPASS
(bootloader) dsp.img@BYPASS
(bootloader) dzdata_32g.img@BYPASS
(bootloader) fsc.img@BYPASS
(bootloader) hosd_signed.img@100%
(bootloader) hyp-8952-1.img@100%
(bootloader) keymaster.img@100%
(bootloader) radio.img@BYPASS
FAILED (remote: 90 hboot pre-update! please flush image again immediately )
finished. total time: 8.797s
htc_fastboot finished. total time: 9.016s

E:\HTC_A9\401>fastboot flash zip HTC_A9_1.10.401.7_partial.zip
htc_fastboot v3.0.9.2 (2015-05-29)
target reported max download size of 800000000 bytes
sending 'zip' (88062 KB)...
OKAY [ 6.538s]
writing 'zip'...
(bootloader) HOSD CL#635503
(bootloader) GPT is up-to-dated. [17408]
(bootloader) start@25
(bootloader) modemst1.img@100%
(bootloader) modemst2.img@100%
(bootloader) pg2fs_ship_signkey.img@100%
(bootloader) rcdata.img@100%
(bootloader) recovery_signed.img@100%
(bootloader) rfg_3.img@100%
(bootloader) rpm-8952-1.img@100%
(bootloader) sbl1-8952-1.img@100%
(bootloader) splash1.nb0@100%
(bootloader) tz-8952-1.img@100%
(bootloader) wcnss.img@100%
(bootloader) aboot_signed.img@100%
(bootloader) adsp.img@100%
(bootloader) sensor_hub.img@BYPASS
(bootloader) apppreload.img@22%
(bootloader) apppreload.img@45%
(bootloader) apppreload.img@68%
(bootloader) apppreload.img@90%
(bootloader) apppreload.img@100%
(bootloader) cmnlib32.img@100%
(bootloader) cota.img@100%
(bootloader) dsp.img@100%
(bootloader) tp_SYN3708.img@100%
(bootloader) tp_SYN3708.img@100%
(bootloader) dzdata_32g.img@100%
(bootloader) fsc.img@100%
(bootloader) hosd_signed.img@100%
(bootloader) hyp-8952-1.img@100%
(bootloader) keymaster.img@100%
(bootloader) radio.img@100%
(bootloader) Update zip file OK
(bootloader) end@Done
OKAY [ 14.785s]
finished. total time: 21.323s
htc_fastboot finished. total time: 21.448s

Reboot in download mode flash images

fastboot flash system system.img
fastboot flash boot boot.img
fastboot flash recovery recovery.img
fastboot reboot

Good luck hoping to solve your issue.