I currently have installed Marketpress v1.0.1 and a few stores already in progress (mostly demo stores) but I am ready to install this new version.
Overwrite or delete first?
Actually my main concern are the related db tables and hopefully I do not necessarily have to delete them in the process as I always end up with a problem where items do not get recreated when I do, i.e. products, categories, etc.
I am not just referring to this plugin but all plugins in general as this has been my experience so now I just leave my db intact unless I absolutely have to deal with it.
The installation page did not mention any special procedure so I assume just an overwrite should be sufficient.