i have bought about 4 different themes, all of them use DrupalExp.
My environment is multisite using domain access, meaning that i have 4 sites, using different theme, but each theme use the DrupalExp Framework, but each DrupalExp Framework is different for each theme.
How do i resolve this issue or how to integrate DrupalExp Framework for the themes i have bought
Which list of themes you have bought? Each theme release, you have updated framework with new features added and bugs fixed. But it still work for old themes. That means you can update latest framework (from latest theme) for all themes you have.