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Thanks again for your support.
I think my mainfile.php is different because I am upgrading from 2.2.4. My mainfile.php doesn't have XOOPS_PATH and XOOPS_VAR_PATH.
Also, there is no xoops_data directory in my file hierarchy - again I think because its version 2.2.4.
I DID manage to solve the blank page problem now that I changed the cache directory to 0777 - thank you very much for that. The backup site now works normally and I am proceeding with the upgrade. I downloaded the full version of 2.3.3 from
https://xoops.org/modules/core/ and am following the directions in the "release_notes.txt" file under "Upgrading from XOOPS 2.0.* above 2.0.14 and 2.2.* (using the full package)". Step 2 of this tells me to delete some files, including htdocs/install/, htdocs/cache/, htdocs/extras/, htdocs/template_c/ and htdocs/uploads/. None of these directories exist in the directory hierarchy that I downloaded above. So I am proceeding in the hope that since they don't exist, they don't need to be deleted, but I'm wondering why the instructions would specify to delete them if they don't exist in the htdocs directory in the first place...
Thanks,
-b-