dabus

I doubt that since the code isn't from him.
But it's no biggie. The code should edit TRA which it doesn't. Works for me on a WinXP Pro SP3.

I tell you to drop the %INSTQ% if it does not work and take the easy way to a working install, which means a manual install by either pausing and running the setups yourself or letting the batch start the setup.

From reading your post I'd guess that you are at this step:

WeiDU.exe --list-languages "%TP2_PATH%" --no-exit-pause
%EDITV32% -p "Language: " TRA
IF "%TRA%" == "" (
echo Skipping %1, component[s] %~2: No language selected: aborting
pause
exit /b 0
)

I don't know why the program didn't edit the variable and I don't know if you are capable of debugging that part.
So using another simple way that shouldn't go wrong and does not include the editing of some variables seems to be the easy way to a working installation, isn't it?

Why bother and look for errors if you can enter a pause or a Setup-XYZ.exe in your own edited batch-version?
It has more or less the effect that you want (pause so you can do something or execute the setup and wait until it's done).

I'm pretty sure that the concept generally works, used it after I messed up my manual install about 3 years ago and didn't want to bother to read the whole PDF again. The only thing that's missing is putting files back into place (like some bcs/bam-files). I'm not sure how those "left out hotfixes" are harming the installation, but I guess they are needed - otherwise they wouldn't be in the batch-file, will they?

If I remind it correctly, some mods that tweak a lot of files are installed being "split" into a few segments, so it will not run out of memory. Although I did, it would still eat up about 800 Megs of my 1 GB and pretty much stall my system. Could be other issues like too much to do while doing its thing (CPU+HD-wise), but still a little concern.

Also be sure that the install-order is not changed if you want to reinstall a few months later. Otherwise some errors that may be fixed by putting mod X in before mod Y are still present for you.

If you didn't throw away your BGConfig (which is located in you BG-folder or start menu), I'd suggest you use it to find out.