How to transfer into Windows Desktop
https://ttlc.intuit.com/community/entering-importing/help/transfer-last-year-s-return-to-turbotax-fo...
Expand the link on Transferring from Mac.
You need to copy the tax file ending in .tax2018 from the Mac to Windows. How to find the tax file,
https://ttlc.intuit.com/community/tax-data-file/help/find-your-tax-data-file-in-mac/00/26206
