I need to do some more "heavy" modifications to some of the pages, and it would be far better to make some changes to the php/html than just hiding elements with css, is there any way I can do this without losing the changes on next update?
Example: In Event Calendar Pro (or "the event calendar" at the wordpress repository for the free version) you can make a "events" folder in your theme, copy a file from the plugin and make any kind of changes to it, and the plugin will then automatically use the file in your "events" folder instead.
Greetings @torsteino and thank you for posting to the Community.
For more information on themeing MarketPress, please go to wp-content/plugins/marketpress/marketpress-includes/themes/Themeing_MarketPress.txt. Here you will find information on how to create a custom design for your MarketPress store.
Hmmm... is there anywhere I can find the original "single-product"-template?
I think this would greatly depend on what theme you're using or planning to use.
I hope this helps @torsteino. If you need anything else, please shout.