Npcap 0.92 fails to install in WinPcap API Compatible Mode

[davemidd]

I previously had 0.91 installed (in Winpcap API Compatible Mode).
Windows 10 64 bit.
Installing 0.92 shows the following error on screen -

Install log attached - NPFInstall.log.txt

If I un-select WinPcap API Compatible Mode then installation does complete ok.

[davemidd]

I just noticed also that the installer has a message that WinPcap is installed, although it isn't actually installed. Related?

[dmiller-nmap]

Thanks for the report, we'll start looking at it.

[BigbyBoss]

Yup, same issue here.
NPFInstall.txt

[dmiller-nmap]

@BigbyBoss Can you also provide NPFInstall.log? Is the error number identical?

[BigbyBoss]

@dmiller-nmap Added it to my previous comment.

[dmiller-nmap]

Ok, it looks like the problem is that you have WinPcap (not Npcap) installed in some way that Npcap is unable to clean up. The "WinPcap API-compatible mode" is intended to completely replace WinPcap (instead of installing as Npcap with all Npcap features), so if we can't uninstall WinPcap, we can't safely install in WinPcap API-compatible mode.

Can you provide the output of DiagReport that will help us identify why the installer thinks WinPcap is installed? Maybe there is something that must be manually removed.

[BigbyBoss]

@dmiller-nmap I tried installing again a few days ago, expecting a change. And i actually managed to install it just fine this time. I got no warning stating i have WinPcap installed and the installation itself was successful.

Still, here's my DiagReport if it's of any use now.

DiagReport-20170708-001913.txt

[davemidd]

Thanks @dmiller-nmap
I don't have WinPcap installed; I removed it when I first installed Npcap a few revisions ago.
It's only this last rev where there's been these problems.
Here's my DiagReport:

DiagReport-20170707-232033.txt

David

[EJMarr]

I too have the same problem after the Creator update, with the installation failing. It complains that winpcap is installed (It is not, I have been using npcap in winpcap compatibility mode), then it halts when failing to uninstall Winpcap. After a clean install without compatibility selected, and an uninstall, it still failed.

Here are the logs, from using DiagReport, and near the end are mentioned four winpcap related files, dating back to when I installed winpcap when I was trying to understand why an application using npcap was not working (that was entirely my fault). Deleting the files from C:Windows\SysWOW64 seems to have cleared the problem. Files were NpcapHelper.exe, Packet.dll, WlanHelper.exe and wpcap.dll.

DiagReport-20170708-112649.txt

install.txt

Ed

[sinfulgurotesque]

I also started having this problem after the Creator Update. It installs fine if I don't try to install in WinPcap API-compatible mode.

DiagReport-20170713-162747.txt

[EJMarr]

Try uninstalling the standard version of npcap, then look for the files in C:Windows\SysWOW64 (NpcapHelper.exe, Packet.dll, WlanHelper.exe and wpcap.dll.). If they are there delete them, then try installing API-compatible version (this worked for me).

[dmiller-nmap]

@EJMarr Thanks especially for the install.log, but I don't see there where an error ocurred. Also, this appears to be an install of Npcap 0.86, not 0.92.

@sinfulgurotesque @davemidd @BigbyBoss Do any of you have an install.log file from right after the error occurs? We would really like to get to the bottom of this and fix it.

[sinfulgurotesque]

@EJMarr That worked you wonderful, beautiful bastard.

[EJMarr]

Here's an install log that I recovered from Deleted Files. I don't have a DiagReport to go with this one, as I first needed a successful install to get the utility available (bit of a bootstrap problem there). It is 0.92, in WinPCap compatible mode, and it did fail.

install 10-22.log.txt

[dmiller-nmap]

Linking to discussion on the nmap-dev mailing list: http://seclists.org/nmap-dev/2017/q3/44