[Sprint HTC EVO 4G LTE] Ahoy Fancypants:
I'm using the recovery from the TWRP website.

I just tried performing a manual wipe from within TWRP. (I selected Wipe, then Swipe to Factory Reset.) Then re-ran the InsertCoin installer, this time choosing to install without wiping. It ran a little longer this time... only a few seconds, though. And I still found myself back at my old OS (this time with reset defaults) when my phone rebooted.

Here's the log file contents:

AROMA Installer version 2.70RC2
(c) 2013 by amarullz xda-developers

ROM Name : InsertCoin
ROM Version : 3.0.6
ROM Author : Chubbzlou
Device : HTC Evo 4G LTE
Start at : Sun Dec 7 18:27:43 2014

Starting InsertCoin Installation

InsertCoin Core Installation
-> Writing Data
mount: failed to mount /dev/block/platform/msm_sdcc.1/by-name/userdata at /data: No such file or directory
Extract: /data/app/com.android.chrome-1.apk
Extract: /data/app/com.android.vending-1.apk
Extract: /data/app/com.dropbox.android-2.apk
Extract: /data/app/com.estrongs.android.pop-1.apk
Extract: /data/app/com.facebook.katana-2.apk
Extract: /data/app/com.fitbit.FitbitMobile-1.apk
Extract: /data/app/com.google.android.apps.books-1.apk
Extract: /data/app/com.google.android.apps.docs-2.apk
Extract: /data/app/com.google.android.apps.magazines-1.apk
Extract: /data/app/com.google.android.apps.maps-1.apk
Extract: /data/app/com.google.android.apps.plus-2.apk
Extract: /data/app/com.google.android.apps.walletnfcrel-1.apk
Extract: /data/app/com.google.android.gm-2.apk
Extract: /data/app/com.google.android.gms-2.apk
Extract: /data/app/com.google.android.googlequicksearchbox-1.apk
Extract: /data/app/com.google.android.inputmethod.latin-1.apk
Extract: /data/app/com.google.android.launcher-1.apk
Extract: /data/app/com.google.android.marvin.talkback-1.apk
Extract: /data/app/com.google.android.music-1.apk
Extract: /data/app/com.google.android.play.games-1.apk
Extract: /data/app/com.google.android.street-1.apk
Extract: /data/app/com.google.android.talk-2.apk
Extract: /data/app/com.google.android.tts-1.apk
Extract: /data/app/com.google.android.videos-1.apk
Extract: /data/app/com.google.android.youtube-1.apk
Extract: /data/app/com.htc.album-1.apk
Extract: /data/app/com.htc.launcher-1.apk
Extract: /data/app/com.htc.sense.ime.langpack.xchi-1.apk
Extract: /data/app/com.htc.videohub.ui-1.apk
Extract: /data/app/com.melodis.midomiMusicIdentifier.freemium-1.apk
Extract: /data/app/com.mxtech.videoplayer.ad-2.apk
Extract: /data/app/com.twitter.android-2.apk
Extract: /data/app/org.adaway-1.apk
Extract: /data/app/tunein.player-1.apk
Extract: /data/app/uk.co.sevendigital.android-1.apk
Extract: /data/preload/mattingshotandpaste_stickers_01.png
Extract: /data/preload/mattingshotandpaste_stickers_02.png
Extract: /data/preload/mattingshotandpaste_stickers_03.png
Extract: /data/preload/mattingshotandpaste_stickers_04.png
Extract: /data/preload/mattingshotandpaste_stickers_05.png
Extract: /data/preload/mattingshotandpaste_stickers_06.png
Extract: /data/preload/mattingshotandpaste_stickers_07.png
Extract: /data/preload/mattingshotandpaste_stickers_08.png
Extract: /data/preload/mattingshotandpaste_stickers_09.png
Extract: /data/preload/mattingshotandpaste_stickers_10.png
Extract: /data/preload/mattingshotandpaste_stickers_11.png
Extract: /data/preload/mattingshotandpaste_stickers_12.png
Extract: /data/preload/mattingshotandpaste_stickers_13.png
Extract: /data/preload/mattingshotandpaste_stickers_14.png
Extract: /data/preload/mattingshotandpaste_stickers_15.png
Extract: /data/preload/mattingshotandpaste_stickers_16.png
Extract: /data/preload/mattingshotandpaste_stickers_17.png
Extract: /data/preload/mattingshotandpaste_stickers_18.png
Extract: /data/preload/mattingshotandpaste_stickers_19.png
Extract: /data/preload/mattingshotandpaste_stickers_20.png
Extract: /data/preload/mattingshotandpaste_stickers_21.png
Extract: /data/preload/mattingshotandpaste_stickers_22.png
Extract: /data/preload/mattingshotandpaste_stickers_23.png
Extract: /data/preload/mattingshotandpaste_stickers_24.png
Extract: /data/preload/mattingshotandpaste_stickers_25.png
Extract: /data/preload/mattingshotandpaste_stickers_26.png
Extract: /data/preload/mattingshotandpaste_stickers_27.png
Extract: /data/preload/mattingshotandpaste_stickers_28.png
Extract: /data/preload/mattingshotandpaste_stickers_29.png
Extract: /data/preload/mattingshotandpaste_stickers_30.png
Extract: /data/preload/mattingshotandpaste_stickers_31.png
about to run program [/tmp/settings.sh] with 1 args
run_program: execv failed: No such file or directory
run_program: child exited with status 1
unmount of /system failed; no such volume
-> Preparing /system for installation
error: make_ext4fs: open: No such file or directory
longjmp botch.

Installer Error (Status 0)

End at : Sun Dec 7 18:27:52 2014

Thanks.