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If you consider "works" with the caveats I stated and that the extension develoer states in his post, then yes it works exactly like it is supposed to. If you want to hop in discord and see what all I am talking about I would be glad to show you. The one thing I would not do is just try and modify the stats on the 1e monsters and think it would work. Some of the treasure will come over but others that are linked the the 2nd ed books you will need to grab the 5th edition version and swap them out like you are doing the monsters. Now if you want to tweak the boss fights you just make a copy of the 5e create and change the stats so they fit the boss fight you want. If you want a quick conversion that is all you need to do. I would then adjust group size so they did not overwhelm the party. I would open a encounter and just change the monsters out for the 5e version of them. While I have not converted ToEE 1e I have converted The Keep on the Borderlands 1e.
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Universal Module Extension will allow you to open ToEE 1e. LordEntrails is right and I bet he has converted a bunch of 1e modules.
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