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The only version you can update to is Photoshop CC, which is the subscription. You don't need to be connected to the internet all the time, when you use CC, just once in a while to validate your install.
Which operating system are you running? What are the specs of your computer?
Your system may be too old and incompatible with current Adobe software.
The last hard copy version of Photoshop was CS6. Since then it's all subscription based.
I believe it's once every 30 days, so you should be ok if you can connect once a month.