Start with replacing Spreadsheet::XLSX (which used to be fine) with Spreadsheet::ParseXLSX, which has a richer feature set, is compatible with Spreadsheet::ParseExcel, well maintained and well supported.
Then as suggested, read their docs to see what you have to change in your existing code to make it work.
Then, once everything works again (hopefully), you can post existing working strict-safe code here to ask for help on the last bits and pieces.
We all have struggled with new modules in the beginning. The questions we ask cause the maintainers to write better docs (most of the time), so newcommers do not have to ask again: the answer is most likely in the docs.
As perl - and the CPAN modules - are OpenSource, you can also follow the links provided by the Monks and "steal" (and learn) from the code and examples already available. I'd suggest having a look at csv2xlsx and replace the bits that require a different parser. You can steal from xlscat and many other tools for that.
Enjoy your journey
In reply to Re^5: Merging 2 xlsx files
by Tux
in thread Merging 2 xlsx files
by mnakkach
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