First Post Alert - Please be nice.

I noticed I was missing an FX (Limiter) but realized I still have 10 (II) when I thought I had 11, (give me a break, I think the first version I had was 4). I looked at what is new in 11 and it definitely seems to be worth the money. But what I want to know is can I add more effects to my version. I would like to install the limiter, but I would also like to have a mastering FX installed too. Are the mastering tools in 11 also available for 10. If not the same ones (I doubt they would be supported in version 10) are there comparable plugs I can download externally. I am missing those as well (folder is empty). I have been mastering my ear which take me several weeks or even months as I have to play it on a big sound system, notate any abnormalities, correct (not in real time) and repeat. Sony is likely looking at this and saying just upgrade you cheap chap.