Upgrade v1.7 to latest

Hello,

Back in 2012 I setup a Magento Store for client with 40K products — has been working great ever since — I have not worked with this client in many years — recently they reached out to me because their site “broke” aka PHP was upgraded to v7 and 1.7 not compatible. I got site back up by switching PHP back down. But I know I need to help them get store upgraded.

Does anyone have advice on best way to migrate site from v1.7 to latest stable ? Store is pretty basic using theme with minimal customizations. Just houses a lot of products that I imported via CSV years ago.

Thanks,

submitted by /u/DrXiTang
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