I'll start with some handy tips for playing them on a modern computer. First off getting them to install on a 64 bit OS is probably not likely. But Gog.com has them for $10 each, and their installs will work on Windows 7 (I haven't tried them on my Win 8 tablet, and I don't have Win 10, but I am sure they work on those OSes as well). There are probably some modder-built installers floating around the internets if you still have the old cds as well.
In any case, neither game can do 1920 x 1080 resolution out of the box. But you can get it on each.
Okay, I found an update to running Kotor 1 at high resolution. Make a backup copy of your Swkotor.exe file. Download the KotOR High Resolution Menus 1.4. Then copy the 3 hires_patcher files to your main Kotor folder. Run the bat file. It will ask you four questions, such as the width, height, etc... that you want. Then go back to the file you downloaded, and navigate to the folder of the screen size you want. They will first be in ratios like 16-9, and so on. Drill down until you find the one you want. Then copy the files over to your Kotor\Override folder. Done! The menus in the game will look really big. But the hud will be visible in gameplay.
Now a year later, I am having problems with even this method. It just is not working anymore, and I do not know why. But what I did find that works is to download the latest version of Flawless Widescreen here. I used the x86 version. Run that and select the Kotor 1 profile. Then start Kotor 1, go to the graphics options, and 1920 x 1080 will be there for you to change to.
You only have to change the graphics options once. But you do have to start Flawless Widescreen every time, before you start Kotor. It is a bit more convenient than the old way of using Flawless Widescreen however.
Kotor 2 has a slightly more complicated fix, but at least you only have to do it once, and then you will always have the high resolution.
Start the game and set it to the highest resolution available, then exit it.
Run the Universal Widescreen Patcher. Select the Kotor2 profile, tell it where the game is on the computer, and put in the resolution you want (1920 x 1080).
Go to your Kotor 2 folder and open swkotor2.ini file.
Set the following:
Under
[Display Options]
Width=1920
Height=1080
Under
[Graphics Options]
Width=1920
Height=1080
Copy the Widescreen UI Fix to the Kotor2\Override folder.
Done!
Steam has the revamped version of Kotor 2 done by Aspyr. It has the advantage of high resolutions built in without need of all the work above. But other than that it does not really add anything I personally care about. It is all Steam achievements, Steam cloud saves, controller support, and so on. The native 5k support would be handy for folks like ghastley that use multiple monitors though. But I think that can be done as with a hack (not positive though). I am glad I did not buy it this way, as I got everything I wanted from the Gog version, without the added joy of DRM.
On to mods.
Kotor 1 & 2
Kotor Tool - A modding tool that allows you to extract and mod the game's files.
Kotor Savegame Editor - A savegame editor that allows you to modify all of your stats, and those of your companions. It works on both games. One really cool thing about it is that it allows you to edit your inventory, and modded items will show up in the editor. So you don't need to use the command console to add them within the game.
Kotor 1
Lightsaber Choices - When you construct your lightsaber on Dantoine, this mod gives you more options in the choice of your color crystal, what type of saber (standard, short, or double), and lets you create a second one too if you want to dual wield.
90SK's K1 Robes - changes the look of the jedi robes, based on the Bastila robes. A big improvement over the vanilla look.
Deadly Stream has a huge amount of Kotor mods. Of course there is a Kotor 1 Nexus site, and Gamewatcher has a few Kotor 1 mods
Kotor 2
First and foremost is the Sith Lords Restored Content Mod, which puts a ton of stuff back into that game that never got used in the release version. I am using it now for the first time, but since I have not gotten far, I cannot say just how much it really changes. It sounds like it adds an awful lot though.
Again Deadly Stream has a bunch of Kotor 2 mods. The Nexus has a Kotor 2 site and Gamewatcher has a Kotor 2 mod site as well.