First, press Windows and R on your keyboard at the same time to open the Run window.
Windows
R
Run
Second, type cmd in the textbox of the window and press Enter or click the button OK and you will see the cmd window.
cmd
Enter
OK
Third, type the code below and press Enter in the cmd window.
the code below
systeminfo
Finally, find the line which starts with System Type and you can see the system architecture.
System Type
system architecture
For example, my computer is x64 which means you'd better choose the file which contains amd64.
x64
amd64
If you can't find a file suitable for your computer or the file downloaded didn't work, do as Another Way do below.
can't find
didn't work
Another Way
Just choose the file Lottery.exe in the Release Page or the file which contains Any CPU in README.md. However, the file is larger than others.
Lottery.exe
Any CPU
larger
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