Method 1:
Setup Microsoft Visio 2019 Professional.
Download the whole package and install it in your machine and activate with the key
Install the package (Double click "VisioPro2019Retail.img" and double click again "Office" folder and install either 32 bit or 64 bit)
Your Visio installation must match your office bit installation (i,e: if your Microsoft office is 64 bit then you must install 64-bit visio 2019)
Check your Microsoft office, which bit is installed (Open MS Word --> Click File --> Click Account --> Click About office)
For both 32/64 bit Download:
https://officecdn.microsoft.com/pr/492350f6-3a01-4f97-b9c0-c7c6ddf67d60/media/en-US/VisioPro2019Retail.img
Method 2:
MS Account Download:
1. Uninstall the old Visio from your computer if you have any.
2. Visit: https://setup.office.com
3. Login or create a login with your email such as Yahoo, Gmail, Hotmail, and so on.
4. Enter the 25 digit key you received from us
5. Select your country and language
6. Click the download link
7. Follow the prompt
8. Activate Project by opening MS project and click File --> Account -> Change Product Key
9. Restart your PC