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Man, sounds like you are having a bad day....I hope I can help...

1)  Go into Avast and put exclusions for Origin, and if you have a bioware game, then also include the bioware saves folder over in your users files...https://www.avast.com/faq.php?article=AVKB168

C:\Users\(your user name)\BioWare     This is the usual location, but there may be some variance with your set-up.

2)  Make sure Origin is running as administrator.

3)  Check your download location/install location correct and there is enough room(triple check it, both location listed in Origin and on the actual drive)

4)  There is a setting in Origin called Download in safe mode, turn it on to see if it makes a difference.  In Origin options, listed down under Diagnostics tab.

5)  Personally, I HATE UAC and turn it off on my computers every time I see it.......yeah I know, it has it's place and can help or stop problems, but I HATE IT!!!

6)  You may also want to post up a Dxdiag file here...see spoiler tag in this post, if you don't know how... http://answers.ea.com/t5/Dragon-Age-Inquisition/How-to-post-the-relevant-info-when-you-create-a-question/m-p/4356255#M47685

7)  You may also try this Visual C package to dl.....https://www.microsoft.com/en-us/download/confirmation.aspx?id=13523

Thank you so much for trying to help me!

I have now put exclusions in Avast for both Origin and the game location. I have Origin set to run as administrator by default and have double checked that it is so. I forgot to mention I did try using the download in safe mode but it had no affect.

Here is the Dxdiag: https://hastebin.com/royaxatubi.tex

And the Visual C package looked identical to the one I had tried using and like last time it said it has been repaired. I wish there was a way to run a diagnostic on Origin itself. Origin says DAI is downloaded but when I try to install it says the download failed. Does that mean the download is corrupt and I have to try downloading again? Which would mean rebooting in Safe Mode with Networking since that was the only way I could get it to download in the first place.

For what it's worth:

Location of Origin

          D:\User\Games\Origin

Location of DAI

          D:\Games\Origin Games\Dragon Age Inquisition

I have installed Origin in C:\Program FIles (x86) as well as D:\Megan\Games\Origin

The only place I haven't tried that I could would be C:\Program FIles

Would that make a difference? I remember from my old computer that some games wouldn't function if saved in Program FIles (x86) so I always had to save them in the one sans x86. But now my set-up has the OS on a much smaller hard drive so the reboot is fast and all my data is on a separate hard drive.

Edit:

I don't know if this helps but this is what pops up when I try to install DAI

A few things of note.....

1)  In your DxDiag file it shows a bunch if issues with windows update failure and MPtelemetry(which is supposed to be microsoft windows defender related by my research).  I would see about getting your OS to check the latest updates and see if you can't get it to fix and or finish your latest updates.  Either roll back the last updates and redo, or see if their is an option to just repair it. 

2)  You may also try a clean boot, this will basically only boot up a limited pool of programs and see if you are having a program cross interference...https://support.microsoft.com/en-us/help/929135/how-to-perform-a-clean-boot-in-windows

3)  I noticed you have a Wacom product installed, possibly one of their tablets??  Try removing that item and related programs.

4)  You may also run a file checker on windows to make sure your OP system hasn't gotten bugged....https://support.microsoft.com/en-us/help/929833/use-the-system-file-checker-tool-to-repair-missing-or-corrupted-system

As far as the install location, at one time it hated to be in anything other than stock location, so you may want to delete/remove origin and reinstall it into stock location which is C:\program files(x86), just to make sure, then go back and make sure the install locations are rechanged back to your D: drive..  And honestly at this point, I would definitely delete the downloaded files of DA;I and reinstall them once you get Origin back into stock location.

Alright so Windows was up-to-date, I suspect the issues/failures was because Windows Defender was disabled maybe?

I did uninstall the Wacom tablet and as far as the file checker it found nothing.

So I did reinstall to PFx86 and made certain the game files were in a Games file in the Origin file. Which seemed to do the trick! The game downloaded and installed!

Yay!!!

And now it appears my issue is that when I load the game it crashes right away. >:[

I thought at first it was due to the fact that I have duel screens set up but it isn't. I tried loading it on both screens with the other disabled but it crashed on both. Any suggestions?

Edit:

1) It appears that one solution is to install older graphics card drivers would that work? And how would I go about un-updating a driver?

2)I ran the Reliability Monitor and this is what I got for DAI when it crashed:

Description
Faulting Application Path: C:\Program Files (x86)\Origin\Games\Dragon Age Inquisition\DragonAgeInquisition.exe

Problem signature
Problem Event Name: APPCRASH
Application Name: DragonAgeInquisition.exe
Application Version: 1.0.0.0
Application Timestamp: 5600f278
Fault Module Name: aswhooka.dll
Fault Module Version: 17.5.3.7495
Fault Module Timestamp: 594bb38f
Exception Code: c0000005
Exception Offset: 0000000000003318
OS Version: 10.0.15063.2.0.0.768.101
Locale ID: 1033
Additional Information 1: 7a6f
Additional Information 2: 7a6f29ae73b177969ba65834742b60c3
Additional Information 3: bb08
Additional Information 4: bb08f285d70998d0d69eff27ddce5cad

Extra information about the problem
Bucket ID: bb1a24a71175e8af567c162e4929039f (120786472637)

On further investigation I found the culprit. 

aswhooka.dll

Is an AVAST file that was causing the game to crash. The solution was to add the game as an exclusion under the behavior shield.