Upload to GEDmatch from MyHeritage
Get your raw data
Log in to MyHeritage.
On the menu at the top of the page, hover over the "DNA" tab and then click on "Manage DNA Kits" in the drop down menu.
The next page will show the list of kits that you manage. Click on the three dots all the way to the right side of the kit you'd like to download the raw data for and then choose "Download" from that drop down menu.
A window will pop up with information about what the raw DNA data file includes. Click "Continue". In the next popup, you will be asked to confirm that you'd like to download your raw DNA data, check the box and then click "Continue".
Check the email associated with your MyHeritage account for the next step. The email should arrive within a few minutes. Open the email and click "Click here to continue with the download". This will redirect you back to back to MyHeritage. Enter your password and click the "Download" button. Save the file to your computer where you can easily locate it again but don’t open it or unzip it. You’ll need it as-is to upload to GEDmatch.