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The Lightroom CC catalog is not compatible with Lightroom 5. When you install Lightroom CC, it will create a copy of your existing catalog, leaving your existing catalog intact and usable by Lightroom 5. You can go ahead and use all the new features to do what you want done. But what you all have to do is export copies of the work that you do in Lightroom CC and then export those copies back into your Lightroom 5 catalog.
LR CC is not available for a single-month subscription. You are buying a $120/year subscription with a $10/month payment plan but for all 12-months, not just for one.
The only way to get a single-month subscription would be to do a Single-App month-to-month PS CC Subscription for $30/month. The PS/ACR will be able to do the same HDRs and Panos as LR, so my suggestion would be to get a month-to-month single-app subscription to PS, then make your HDRs and Panos and save those as 16-bit TIFs, then import those TIFs into LR 5.
The information about what plans are available is here: https://creative.adobe.com/plans
I suppose I was thinking that one could install the CC trial version and do those few images using the trial version. But you are right, subscribing to the creative cloud is a minimum one-year commitment.