Not surprising as there have been lots of changes to the bill layout functionality along the way! The later Timeslips versions use .tsl files for the layouts where the earlier versions like your previous 2004 used .rpt files. My best advice is that you will need to find those RPT files and import them to TSL files individually and then assign to your clients. Note the import/export toolbits on the right hand toolbar of the bill and statement layout list you included above.
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