Thanks for the heads up
I assume all the different files produced for each new cart have a new file or versions number at the end "like_this_2.php" and "like_this_3.php"
I then gather that i can have many different cart types on a single web site ( offering different purchase, checkout methods)
To install version 5 on my mac 10.6.2
The best way is-----
1. Delete extension version 4.5 from extension manager, then delete macfilecache, then install version 5??
2. Disable extension version 4.5, then delete macfilecache, then install version 5?? then delete version 4.5 for extension manager??
Thanks for your help