Sumatra PDF is a PDF, ePub, MOBI, CHM, XPS, DjVu, CBZ, CBR reader for Windows

Problem with the "user" installation of Sumatra PDF 3.2+

Why did it install to user/appdata/local ?
Why is it asking me if it is okay to open the file, every time I run the executable that is in appdata/local - I shouldn’t have to click on “don’t ask for this file” … because it should not be asking me that in the first place.
Why doesn’t it install in Program Files?
The installation location and the fact that it is asking me each time do I want to open the file makes me wonder if it is even safe to use the program.
Is the installer broken?

Without knowing how your system is set for individual users the best I can suggest is to read Unable to run as standard user #1502 and

A single user install should work by default for one user only.

However, if you have multiple accounts (e.g. basic and admin) with resulting issues over running rights then its best to install a single copy into Program Files (each user account should then have its own settings files without UAC conflics)

I have the only account on the PC. I own the PC. I do not have any user accounts. When I installed your software it did not install to Program Files like a normal program would.

What system information do you need me to show you? If the program is supposed to install to Program Files, it didn’t, and that’s a problem with the software not a problem with my setup.So back to my original question. Problem with INSTALL. Not “user” install.

Why did it install to user/appdata/local?
Why didn’t install to Program Files?

As shown in the above linked discussions. both I as a user and the other user moderator feel this could be handled differently.

If your installation to the local application area causes your installation an individual user rights problems,
Then it is best to uninstall and re-install to normal Program Files area using the installer options button.

Okay, so now I have it installed into Program Files. It still pops up “Security Warning” dialog “Do you want to run this file?” I have the option to take the check mark out of “Always ask before opening this file” - but why should I have to do this?

Is this a normal thing too? No other program i have ever installed to anywhere pops that up. It pops up when I run an installer, as it should, but why is it popping up just because I want to run the program to read a PDF?


Unfortunately Nanny mcSoft is trying its damnedest to protect you from software that is not high on their own list of approved applications, rest assured if you downloaded from this site download page (and not the windows store pirate copy!) then it should be safe to “always run”

That is where I downloaded it from.

This was a common problem introduced by Windows after XP. It is due to combined settings in the system and browser. See

After downloading the file, the browser – both IE and Chrome – adds an “alternate stream” to it, named Zone.Identifier , which says that the file came from the “Internet” zone. When you double-click a file in Windows Explorer, it checks if such a stream is present, and asks for confirmation if necessary. This is not restricted to executables – any file tagged this way will require confirmation.

Oddly wherever Firefox saves my SumatraPDF downloads does not raise the warning but here I downloaded Java Runtime Executable from the reputable Oracle site nine days ago (I may have used Internet Explorer?) and I will need to tick the box to be able to run it without the warning: