daupdater.exe

Search here:

Steam\steamapps\common\Dragon Age\bin_ship\daupdater.exe

or

Origin Games\Install\Dragon Age\bin_ship\daupdater.exe

About the missing DLC's, follow the instructions from the Dragon Age Wikia ("Manual installation"). You'll have to download the required DLC files and install them with the Dragon Age Content Updater Tool (Dragon Age\bin_ship\daupdater.exe).

Ultimate Edition DLC List - campaigns:

• Witch Hunt: DAO_PRC_STR_1.1.dazip
• Witch Hunt Offer: DAO_PRC_STR_O_1.0.dazip
• The Darkspawn Chronicles: DAO_PRC_DRK_1.0.dazip
• The Darkspawn Chronicles Offer: DAO_PRC_DRK_O_1.0.dazip
• The Golems of Amgarrak: DAO_PRC_GIB_1.0.dazip
• The Golems of Amgarrak Offer: DAO_PRC_GIB_O_1.0.dazip
• Leliana's Song: DAO_PRC_LEL_1.0.dazip
• Leliana's Song Offer: DAO_PRC_LEL_O_1.0.dazip

Ultimate Edition DLC List - extra items*/quests**/add-ons*** that will be added to the main game and dlc campaigns):

• ***Return to Ostagar : DAO_PRC_CP_1_1.1.dazip
• Return to Ostagar Offer: DAO_PRC_OCP_1_1.1.dazip
• ***Warden's Keep: DAO_PRC_NRX_1_1.0.dazip
• Warden's Keep Offer: DAO_PRC_ONRX_1_1.0.dazip
• ***The Stone Prisoner: DAO_PRC_CP_2_1.0.dazip
• The Stone Prisoner Offer: DAO_PRC_OCP_2_1.0.dazip
• *Feastday Gifts: DAO_PRC_CP_3_1.0.dazip
• Feastday Gifts Offer: DAO_PRC_OCP_3_1.0.dazip
• *Feastday Pranks: DAO_PRC_CP_7_1.0.dazip
• Feastday Gifts Offer: DAO_PRC_OCP_7_1.0.dazip
• *Witchcraft (for Origins): DAO_PRC_STR_DAO_1.0.dazip
• *Witchcraft (for Awakening): DAO_PRC_STR_EP1_1.0.dazip
• **Golem's Might (for Origins): DAO_PRC_GIB_DAO_1.0.dazip
• **Golem's Might (for Awakening): DAO_PRC_GIB_EP1_1.0.dazip
• *Blightblood (for Origins): DAO_PRC_DRK_DAO_1.0.dazip
• *Blightblood (for Awakening): DAO_PRC_DRK_EP1_1.0.dazip
• *Battledress of the Provocateur (for Origins): DAO_PRC_LEL_DAO_1.0.dazip
• *Battledress of the Provocateur (for Awakening): DAO_PRC_LEL_EP1_1.0.dazip
• *Blood Dragon Armor: DAO_PRC_PROMO_ME_1.1.dazip

Note - Offers: They are required for the DLCs to start off properly.
Note - Feastday: Feastday Gifts and Feastday Pranks are available in a combo pack named Feastday Combo Pack. If you have one you don't need the other.