Silent Install Fails, Resultcode = -8 [Now ResultCode 0 but not installed] - command-line

Question

I am trying to install a program silently (the program is old, has InstallShield v7.00). However, every time I run the command, it does nothing and the setup.log file states "ResultCode=-8".
That ResultCode indicates that an invalid path to the InstallShield Silent installation script file was specified (which I am assuming to be the response file I generated earlier, which is named setup.iss).
Setup.exe and setup.iss are both in the same folder. I tried specifying the exact path to both files, and not, as seen in the list of commands I have tried below:
"C:\Test\setup.exe" /s /f1"C:\Test\setup.iss"
setup.exe /s /f1 setup.iss (CMD directory is in C:\Test)
setup.exe /s (Thought it would just find the setup file automatically as they are in the same folder)
I am trying to install EPSON OPOS ADK, for which the installation manual states the exact commands I am using are correct.
There is no MSI file contained in the EXE file (or, if there is, I cannot extract it with WinRAR and I could not find it in ProgramData while the setup was running).
Does anyone know what I am doing wrong or what I can do?
EDIT: Below is the contents of my setup.iss file:
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-DlgOrder]
Dlg1={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdWelcome-0
Count=7
Dlg2={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdLicense2-0
Dlg3={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdSetupType-0
Dlg4={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdStartCopy-0
Dlg5={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-AskOptions-0
Dlg6={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdFinish-0
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdWelcome-0]
Result=1
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdLicense2-0]
Result=1
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdSetupType-0]
szDir=C:\Program Files (x86)\OPOS\Epson2
Result=301
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdStartCopy-0]
Result=1
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-AskOptions-0]
Result=1
Sel-0=1
Sel-1=0
Sel-2=1
Sel-3=0
[Application]
Name=EPSON OPOS ADK
Version=031.000.01000
Company=SEIKO EPSON CORPORATION
Lang=0009
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdFinish-0]
Result=1
bOpt1=0
bOpt2=0
EDIT 2:
So I ran the recording for the .iss file again, but this time instead of just doing "setup -r", I did "setup -r f1"C:\"" instead. This should make no difference other than telling it where to save the recording. However, I got a different .iss file out of it. Here it is:
[InstallShield Silent]
Version=v7.00
File=Response File
[File Transfer]
OverwrittenReadOnly=NoToAll
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-DlgOrder]
Dlg0={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-Uninstall-0
Count=7
Dlg1={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdWelcome-0
Dlg2={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdLicense2-0
Dlg3={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdSetupType-0
Dlg4={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdStartCopy-0
Dlg5={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-AskOptions-0
Dlg6={0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdFinish-0
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-Uninstall-0]
Uninstall=0
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdWelcome-0]
Result=1
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdLicense2-0]
Result=1
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdSetupType-0]
szDir=C:\Program Files (x86)\OPOS\Epson2
Result=301
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdStartCopy-0]
Result=1
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-AskOptions-0]
Result=1
Sel-0=1
Sel-1=0
Sel-2=1
Sel-3=0
[Application]
Name=EPSON OPOS ADK
Version=031.000.01000
Company=SEIKO EPSON CORPORATION
Lang=0009
[{0EEDEE2B-7C9D-4584-B2B5-C28C93678BC1}-SdFinish-0]
Result=1
bOpt1=0
bOpt2=0
I was very happy when I saw it was different, and figured my issue would be solved. Well, not exactly.
Now, instead of getting ResultCode = -8, I am getting ResultCode = 0. A code of 0 indicates there was a successful installation. However, the program did NOT install. Nothing was touched. I noticed this before even looking at the code because it finished "installing" almost immediately after running the command, with no loading icons or anything.
So now, InstallShield is reporting that the program was successfully installed but it, in actuality, was not. I tried re-recording the .iss file numerous more times but I am just getting this same file now. The file is likely no longer the issue. However, I am at a loss for what the issue could be now.

Answer 1

Setup.iss: I guess the real problem might be that there is an error in your setup.iss file. Can we see its content? Maybe the setup.iss you are using is for another Setup.exe entirely? Try re-generating a new one?
UPDATE: Maybe have a look here as well: Epson OPOS ADK for .NET drivers for Windows 7
That silent.iss response file seems to lack a header section when compared with this documentation: Performing Silent Installations and Uninstallations (PDF, section "InstallScript Installations" page 3 onwards).
Setup.exe Extract: Maybe also make sure that this is not an MSI setup after all:
Short version: Programmatically extract contents of InstallShield setup.exe
Long version: Extract MSI from EXE
And:
Extracting from an MSI (administrative installation).
How to deploy the Installshield MSI without having to run Setup.exe
Sample Setup.exe Command Lines: For inspiration an ancient Itninja / AppDeploy PDF with sample Installshield setup.exe commands (I think the last few entries in the document were never finished, they just all say Setup.exe /uninst - so just ignore them). Did you try the /SMS parameter? I don't see how that would solve your particular problem, but you should know about the switch anyway.
Some Links:
InstallShield Error Codes (Setup.log)
InstallShield Setup Silent Installation Switches
Performing Silent Installations and Uninstallations (PDF)
EPSON OPOS ADK for .NET Manual (PDF)
Installshield 2018 Help File:
Setup.exe and Update.exe Command-Line Parameters
Advanced UI and Suite/Advanced UI Setup.exe Command-Line Parameters
Setup.exe (InstallScript Projects)