Good day, christiemares.

I will break your question down a bit so we can make sure we are covering everything and make sure we get you the answers you are looking for.

For your first question, launching Internet Explorer on Mac isn’t possible. However, you can use any other third-party browser available on macOS as an alternative.

Moving on to your next question, I'll s how you how to convert your QB Desktop for Windows company file to a Mac:

1. Update QuickBooks Desktop for Windows to the latest release.
2. Open the company file in QuickBooks Desktop for Windows.
3. Re-sort lists.
4. Rebuild and Verify your company file data.
5. Create a copy of the company file.
   1. Click the File menu.
   2. Choose Utilities.
   3. Select Copy Company File for QuickBooks Desktop for Mac.
   4. Save the file on a separate file/folder location with the extension MAC.qbb.
6. Restore the file using QuickBooks Desktop for Mac.
   1. In the No Company Open window, choose Browse.
   2. Search for the file you want to restore.
   3. If the file is coming from an external drive, create a copy on your device.
   4. QuickBooks will ask if you want to restore a QuickBooks Desktop for Windows file. Choose OK.
   5. Type in a name for the restored.
   6. Click Save.

If you’re still prompted with an error while trying to import the company file, let’s restore a backup (.dmg) in QuickBooks Mac.

The complete instructions about converting the Windows file to QuickBooks Desktop for Mac can be found in this article.

I'll leave you with a guide to know anything about QuickBooks Desktop for Mac: QuickBooks Desktop Mac 2020 User’s Guide.

If you have additional questions or concerns, just leave me a comment below. I’ll be happy to help you out.