I have had this problem with previous OTA updates on my HTC. The problem I ran into is that my phone didn't have enough "space" for the update to actually install gracefully. The bigger problem is that there are many different places the phone can run out of "space". I ended up booting into the recovery to wipe the cache partition (for some details see "Low on space" warning with over 50% free). I also ended up wiping the app cache and data on a number of apps (including the launcher -- lost all my icons, gmail, maps, etc) to reduce "space" used until the update installed. I don't recall what exactly pushed the install over the edge and made it go, but it was painful enough that I'm not bothering with the latest update (its just a point release, despite the version number they're showing you its not an ICS update).

I have had this problem with previous OTA updates on my HTC. The problem I ran into is that my phone didn't have enough "space" for the update to actually install gracefully. The bigger problem is that there are many different places the phone can run out of "space". I ended up booting into the recovery to wipe the cache partition (for some details see "Low on space" warning with over 50% free). I also ended up wiping the app cache and data on a number of apps (including the launcher -- lost all my icons, gmail, maps, etc) to reduce "space" used until the update installed. I don't recall what exactly pushed the install over the edge and made it go, but it was painful enough that I'm not bothering with the latest update (its just a point release, despite the version number they're showing you its not an ICS update).