I decided to include here the fixes to the wrong textures in the excellent Theta HD mod.
Theta HD relies mostly on vanilla textures and modifies only the very low-res static textures (terrain, building, etc.) which hurt the eye. It can be considered as the lightest HD mod in terms of VRAM requirements.

If I find other errors in Theta HD, please notify me in the post section. I will add the fixes here.

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Description:

So far, I have found only one real error in Theta HD textures:
1) Wrong texture for the Loghain tent in Ostagar. The texture was erroneously changed with another one. See the pictures.
I remade the diffuse map "loghain_tent_small_02d.dds" upscaling the vanilla one to 1k and adding some canvas texture to mimic the one in Theta HD (not identical, but similar). If you only want this fix, download the file in "Miscellaneous" section.
2) Minor. Some wrong pixels or noise in many of the diffuse maps.

Version 1.3 (final): I further cleaned the original Theta HD textures of the pesky pixels (noise or artifacts from compression or wrong alpha merging) using inpainting. I discarded the alpha channel when this was just junk. I restored the original "prp_wallarchiron_d.dds" texture after cleaning noise. I consider this version as final.

Optional Files:
1) Frost Mountain Pass Building Fix (2.3). Made after a suggestion. The stand outside Orzammar entrance has a weird effect on its floor, due to a wrong orientation of the texture maps. I corrected the orientations and tiling in the mesh model (using gmax), so now the textures have the right behavior with illumination. You can complement it with the HD diffuse map from Manually Optimized Textures (AP Neural Enhanced Textures) for some better detail. Look for "dne_bldng_master.dds" file under "Master" folder there and put it in the same folder of the fix here.
There are two version: one with a rough surface and one with a smooth surface. Chose the one you prefer (see the pics in image section).
In version 2.3 I deleted the '*.phy' files (with collisions info) because the vanilla files are ok.

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Old versions:

Version 1.2: I applied the exact canvas filter used in the other tents (GIMP Clothify) to the Loghain tent. The difference is barely visible. Probably does not worth to update if you have the previous version. I cleaned further the gate texture, but you should not see the difference in the game due to the mask in alpha channel.

Version 1.1: I uploaded a full package with all Theta HD textures (the original mod is not needed). In this package, I further optimized all the diffuse maps having originally a binary alpha channel, preserving it even in the cases I think it is not needed. For the textures with interpolated alpha, I kept the original files from Theta HD (DXT5 format). As a result, the overall size of the package is reduced by 40% which should help VRAM and stability, especially in low-end PCs. In this full version, I also changed the diffuse map for the gate: "prp_wallarchiron_d.dds" from Theta HD mod, which resulted noisy, and I generated a new one at same resolution and preserving the style, but with improved details (barely visible).

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Installation:

A) If you want the Complete Pack, you do not need the original Theta HD mod. Simply extract the main file here in your override folder.

B) If you want the Loghain tent Fix only:
1) Remove the files "loghain_tent_small_02n.dds" and "loghain_tent_small_02s.dds" from the Theta HD directory in the override folder. Indeed, Theta HD is a collection of diffuse maps, while keeping the original normal and specular maps, so there is no reason these two files are present (and they are wrong).
2) Overwrite "loghain_tent_small_02d.dds" with the one in the Miscellaneous Files here.

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Recommended mods:
Statues and Totems - Higher resolution textures - HR HD HQ. It applies the same concept of Theta HD to other assets. I recommend this mod together with Theta HD (Fix) if you want a minimal HD overhaul (they fix only few very low-res textures) with low impact on performance, if you have a low-end PC and you have crashes during playing.

Alternatives recommendation:
Theta HD (Fix) is superseeded by Manually Optimized Textures (AP Neural Enhanced Textures). I suggest this one for a deeper HD overhaul of static textures, with a higher performance impact (but perfectly handled on a mid-range PC).

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My other DAO mods:
Amor of the Black Fox (Hsli compatible). A skimpy version of Nezroi Armor of the Black Fox to be compatible with Hsli Female Light Armor Replacement. I also included an optional fix of the tint maps of the Hsli mod.
Chantry Robes - Inquisition Colors (Fix). A fix to the diffuse maps of the mod Chantry Robes - Inquisition Colors.
YAHD - Yet Another HD Mod (and Fixes). A project for HD upscaling of creatures' textures at 1k/2k for balance in quality and performance.
Male underwear retexture. Retexture of the human male underwear with dark grey underwear.
Creatures Tweaks. Some addons to my personal favorite creatures.

Collaborations:
Chasind Robe (yet another attempt). Original idea from stadavan. Tight version of the Chasind robe with a more covered chest and other minor shadow corrections, while keeping vanilla style as close as possible.
Hoods (for the Girls). Help from RogueLass. Some wearable custom hoods for companions (girls) to match with notable armors and robes. At present Morrigan and Leliana only.