I've tried to install a several mods and they all mess up, causing problems. I use Nexus Mod Manager to install the mods from. When I'm installing the mod, a dialog appeared, saying some files were already there and asked me if I want to overwrite them.
Animkit 2.1 allows the animations in Morrowind to be customized by various mods, fixing the originally atrocious walk/run/monster animations. Next, simply run the Morrowind launcher as an admin, go to Data Files, and check all of the plugins. Go to your Morrowind install folder, and open the folder named Mlox. Launch Mlox.exe. When you download the file it will come with the Textures and Meshes and other Data Files and then all the.esps for the plug-ins that need them. So most of the mods you can recognise by name and then not include if you don't want them.
I clicked 'Yes to all' and it didn't complain after that. However, when I launched the game, another dialog appeared saying 'master file TRXXX.esm is missing' and it gave me 'Yes' or 'No' choice to continue, but both choices lead to the game crashing. I'm able to re-launch the game only if I uninstall all the mods I've installed using the Nexus Mod Manager, leaving only the mods installed outside of it (such as Better Bodies and Morrowind Overhaul). Nevertheless, I still get a dialog that says: The currently selected master file and plugins do not match the ones used by this saved game. Errors may occur during loading or game play. Do you wish to continue?
![Data Data](http://i.imgur.com/5ZFU6TL.jpg)
How can I properly install mods in Morrowind so I don't receive errors, crashes, and warnings like these? Concerning the TRXXX.esm, you're most likely trying to use (good choice!) Antediluvian Secrets, which requires as well, so I guess the latter has been forgotten. Concerning the warning, this means that one of the plugins you are using was saved using a different version of the game main files, e.g. Native Morrowind.esm while you're using the. You can usually ignore this, although you should at least once check whether you're accidentally using a Morrowind-without-Bloodmoon version of a plugin that also has a Morrowind-with-Bloodmoon version if you have Bloodmoon installed or vice vers.
If you want to get rid of the warning for good, you have to open the respective plugin's.esp file with the TES Construction Set (using your actual Morrowind.esm etc versions as base files) and simply save it again (keep a backup though). That should update the claimed dependency without modifying anything else. You may as well try loading it. If something is missing it might fail, for example, you have a weapon that is from the mod. However, it won't damage your saved file so it's a no risk option. Although if it does load, I recommend you make a new save and leave the old one intact in case something goes wrong. If your character isn't in a new mod content area, or you don't have any mod items, aka you are unaffected by the mods, it should happily carry on playing.
The ideal scenario is to have the mods installed that were used previously, but it is not a requirement hence the warning.