I am having trouble upgrading to Yosemite from OS X 10.7.5.  The download just freezes.

I am not able to upgrade from OS X 10.7.5 to Yosemite.  The download stays frozen.  Anything I can do?

The OS itself is free, although that doesn't mean there's no cost to upgrade. You sound like you've put in the research and have backups - I'd be inclined to clone your working 10.7 system to an external drive using Carbon Copy Cloner or SuperDuper so you can quickly recover in case 10.10 doesn't do what you need. You can't recover quickly from Time Machine.
Matt

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