Migrating from Desktop Pro 2015 to Desktop for Mac 2021

I have been using Desktop Pro 2015 with no issues.  I contacted Intuit in December to inquire about how to migrate from Desktop Pro 2015 to Desktop for Mac (Big Sur).  I was told then that technical support would give me a complementary upgrade to latest version of the PC Desktop Pro to facilitate the data transfer which she said would be no problem.  She said technical support would guide me through the process.  That influenced my decision to prder a MacBook Pro laptop.  I contacted Intuit sales today and the sales guy said data migration not going to happen unless I go with the monthly program which I do not need or want.  I run a simple online business with no employees and perhaps under 250 items.  I would like to keep my existing data including customer and product information.  Is the data migration from Desktop Pro 2015 with the complementary upgrade to Desktop for Mac possible with guidance from technical support?  If not what has changed since I was told in December 2020 that it would not be a problem? Thanks!