Merging/importing a library from a non-Mac to a Mac with empty en file

I am trying to import an old library from an old laptop (Endnote X7) and merge it with my new library on my Mac (Endnote X7). FOr the old library I have the fodler (containing sub folders of PDF, RDB and trash folder containing but the corresponding library.enl file is empty. WHen I open the trash data file it only contains 19 references whereas I know the library contained hundreds of (as evidenced by the PDFs that are still in the folder). 

I don’t want to have to re-enter all the citation data again for each PDFs, whcih I assume I can easily import.

Any suggestioons please as hours went into compiling this library.

Endnote files created on EndNote software version 8 and later are cross-compatible for PC and Mac. Refer to the Knowledgebase article “Recovering a library when only the .Data folder can be found” at