pagination error after upgrading from j2.5 to j3.4

[smartgig]

got it,  Transliteration tables can be used to convert other languages characters to English characters.
Well, with Unicode aliases, Transliteration is not needed, as the original title is directly used in the URL (Which improves SEO)

If I set Unicode Alias to ON then any jD entry that is created after that will work, as it directly uses the download title as the alias stores it in the database. But it doesn't affect the old jD entries because they have been created with having Unicode alias option set to OFF, so a stripped alias (that only contain numbers) is stored in the database.

Adding an option in jD settings to control whether to use the jD alias in the URL or not can fix the problem. Although this is a bug with Joomal URL Parser and the URL Parser should be modified to parse aliases starting with a number correctly.

[smartgig]

Have you fixed this bug in the new jDownloads version?

[ColinM]

smartgig
This is not a specific jD bug but as you say it looks like a Joomla! bug with aliases starting with a digit.  In such a situation it is not productive to put in a fix which one day should no longer be needed.  The root of your problem is, I believe, that the older files did not have unicode aliases, so it would perhaps be better to have a tool that would recompute the aliases from the filename dependant on the current setting of the 'Use UTF-8 ' field in Config - Files and Folders Tab.
This should not upset the Content plugin as that uses Category and Download IDs

Maybe you could enter this into the Suggestions.

If someone has used Transliteration of the file name then there is little that can be done as the original info has gone!  Incidentally have you contacted the Persian Language people about the absence of a transliteration ability?

Colin