I tried to revert to Phoca Download 5.1.3. It seems to work fine but the indexing ends with an error message.
I understand what you mean by having a module ready for Joomla! 6.
I deduce that the error message below, which I encounter at the end of indexing, is related to this need to redevelop your plugins specifically for J!6. Do you confirm this?
An Error Has Occurred
Joomla\Registry\Format\Json::stringToObject(): Argument #1 ($data) must be of type string, null given, called in /home/site/libraries/vendor/joomla/registry/src/Registry.php on line 335
Phocadownload
150 of 182
Phocadownloadcategory
0 of 1
Also note that the error occurs only with the plugin Phocadownloadcategory. If I deactivate it, I no longer have the error, but the indexing still does not add the new elements created in the Phoca Download files (title corrected, description added).