Language: Serbian (Latin, Serbia and Montenegro (Former))

Hi everyone. I have SDL Trados Studio 2014 Freelance PLUS. Just recently I had to switch to another computer and install Trados again. The problem occurred within language pairs. Language: Serbian (Latin, Serbia and Montenegro (Former)) is no longer available (I cannot choose that pair in 5 initial languages) and majority of my work with different companies is based on that pair. Also, the software doesn't recognize my memories. How can I use the old memories? It is really important, otherwise I will lose more than 5 years of work for some companies. Thanks! btw. If you know how, please be a little more specific in your explanations, I am not a ninja in this software :))