Lets try this:
Use Internet Explorer
Before doing so however place your mouse on a blank space on the desktop, right click, select NEW. select FOLDER, name the new folder NetGuard Download.
That will create an empty destination folder for the download on your desktop
Will give you this page:
That page will give a description and the "download" button;
When you click the download button you should see this at the bottom of your screen:
Click the small "down arrow" just to the right of "save" and select "save as"
that will open a window like this:
In the left pane click on DESKTOP, that will display the contents of your desktop in the right hand pane, look for and click in the NetGuard Download folder you created earlier, click OPEN, click SAVE.
That will steer the destination of the download to the target folder.
When the download is complete, open the folder and you should see the download as an .EXE file (executable)
Clicking on the netguard.exe will start the install process.