Richard
Are you talking about technical support on your PC? Is that what you mean by warranty?
If so what make is your computer and where does the technical support come from?
I know that certain major suppliers offer such home support packages. If so you will have to read the conditions of your warranty. If you buy a computer it is perfectly reasonable that you should install software on it other than the basic software the computer comes with. Any warranty that excludes this activity is frankly a joke and not worth the paper it's written on.
As far as BIN is concerned.
Have you got an error free installation of MSTS that's working happily at the moment?
Have you any additional routes installed and if so are these running with out any problems?
If the answer to either of the above is yes but I have a problem. Sort that out first. It's unlikely that BIN would change thes problems one way or another but it just might. Then you've three pieces of software on your machine not working because of errors
A golden rule is install NOTHING NEW if you are having problems. Sort them out first.
IF you have MSTS and some additional toutes and NO problems or errors. Then provided you download the patch and read the instructions .....and the read the instructions again .....and the follow them to the letter you should find you have no noticeable difference in MSTS UNTIL you actually run it. Then all the new features will be there.
IF YOU DON'T LIKE IT .....UNINSTALL IT ....don't start fiddling around in the programme or deleteing stuff or changing stuff.
IF YOU UNINSTALL IT READ THE INSTRUCTIONS AND UNINSTALL IT EXACTLY ....THATS EXACTLY as they tell you. Don't do it your way, don't do it the way your know it all mate tells you to do it DO IT THE WAY THE INSTRUCTIONS IN THE BIN PATCH tell you to do it.

I've finished shouting now ....but I did it for a purpose. There's always some "expert" looking over your shoulder who say's "oh you don't want to do that" so in this case tell them to "shut the blazes up" and do it the way George tells you to do it.
People here have been installing and uninstalling versions to test things and as they've pointed out it's quick and painless provided you follow the instructions. IF in doubt go to the BIN forum and read up previous queries or post your detailed problem there. Chances are once you see what improvements it brings you'll leave it where it is and like many of us accept that as the new MSTS.
Geoff