X2Pro thats compatible with OS X 10.7.5 please!

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Im just about to export a documentary for postproduction on the sound and need to have the X2Pro in order to get the AAf file. But the X2Pro v3.0.13 (which is the one I can access on App Store) is not compatible with my os x 10.7.5 and if I update the os x my fcpx (10.0.9) won't be compatible and I dont dare to update the fcpx at this very final stage of my working process! I read that X2Pro v2,5 would be compatible with my os x but can I find it anywhere?! Grateful for any help asap!