At least in the upgrade from 2.05 to 2.06 there were a lot of changes, a bunch it looked like were changing a variable from user to email... I assume there's been some discussion on that already. But you could do this if you wanted, it would very labor-intensive it looks like. I do find diff output very easy to read and identify what has changed. If you think it would help you, here's how I did it (unix system only - I don't know windows for nothing)...

1. create two temp directories and upload the install.dat files from the two versions you want to see the differences between, one into each temp directory.

2. untar each of the .dat files by running 'tar xf filename' from the command line.

3. change directories to the one where these subdirectories were created and run diff this way
diff -r directory1name directory2name > outputfilename.txt

now in that directory you will have a text file that shows the difference between every file in those two directories, showing the filenames that had changes, the line numbers of the differences and the code that is different between the two.

I would also suggest that before you run the diff, go into the spellcheck directory for each of these and delete all the .ndx files (it creates a huge amount in the diff output for relatively minor changes).

I hope that helps.