artpapa

I'm not sure what this means. Squarespace 7.1 does not have templates in the traditional sense. When you start a new website on Squarespace 7.1 you get to pick a starting point with pre-designed content and pre-selected fonts and colours, but that's all you get, the functionality of every template is identical, and that's also true of the upgrade process. When you upgrade you won't get to pick one of these starting points, but it will try to pull the fonts and colours and content from your old site instead. This is no real loss unless you want the exact design aesthetic of the starting point and plan to do nothing more than swap out the demo content for your own. The template pages/sections are generally available when adding a new page/section, and you can pick a font pack or colour scheme in the styles menu.

You can find Squarespace Support here:
https://support.squarespace.com/hc/en-us/requests/new#choose-topic

Thanks for the clear, timely response!
What does SOS Support mean, and where to look for it?

There are quite a few things to take into consideration when starting to design a new website to replace an old one. If you have content like blogs, stores, or customers etc. you can transfer some of this, but much needs to be recreated. Your domain can be easily moved but your Squarespace subscription will need to be purchased again for the new website, you can't move it, but you can request a prorated refund from SQS Support if you have a significant amount of time remaining.  The 14-day trial is limiting, but can be extended.

Please advise the best templates for creating an online gallery for selling paintings and limited edition prints