Q: OS Upgrade

I currently using 10.6.8 and running FCP Pro X version 10.0.9 on it. there is a plugin that I need to run FxFactory Pro. However, in order for me to do this I have to upgrade to FCP X 10.1.4. But in order to do that I must upgrade my OS. The last time I ran into this is when Leopard came out I was using Final Cut Express HD. I upgraded to Leopard and then I had to deinstall Leopard because Final Cut Express HD would not run along with other applications that I previously purchased. Therefore, I am very apprehensive about upgrading the OS with the fear of having to purchase new applications from apple to replace those that will no longer wait.

So my my question is, will I have to purchase new applications to replace the ones I believe will not work in 10.1.4?

Please advise

Here is my current system:

Model Name: Mac Pro

  Model Identifier: MacPro4,1

  Processor Name: Quad-Core Intel Xeon

  Processor Speed: 2.66 GHz

  Number Of Processors: 2

  Total Number Of Cores: 8

  L2 Cache (per core): 256 KB

  L3 Cache (per processor): 8 MB

  Memory: 12 GB

  Processor Interconnect Speed: 6.4 GT/s

  Boot ROM Version: MP41.0081.B07

  SMC Version (system): 1.39f5

  SMC Version (processor tray): 1.39f5

  Serial Number (system): H0******20H

  Serial Number (processor tray): J5******UC   

  Hardware UUID: CAD346AA-EC54-5BC8-A409-D7B096272120

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