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prasad,
The correct way is to do each upgrade in succession (one after the other). Sometimes the XOOPS team provides multiple version upgrades but not always.
Another, albeit riskier approach, is to build your own multiple version upgrade. To do that you download each version upgrade 2.0.7.3... etc.
Then merge files from oldest to newest. The combined file becomes your upgrade. SImply perform a regular upgrade from that point forward. A couple points of note, this approach requires accuracy in merging, requires using single version upgrades so that you don't loose files.
Good luck. And in the future, stay current!