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Windows update from Bisq 1.10.7 to 1.10.8 fails because Windows Installer asks for missing main.msi #8078

Description

@KUHU-100

System:

Windows 10 Pro
Existing Bisq installation: 1.10.7
Target version: 1.10.8
No open trades or offers at the time of update
Bisq data directory backed up before further troubleshooting

Problem:
I tried to update Bisq from 1.10.7 to 1.10.8 using the official Windows installer Bisq-64bit-1.10.8.exe.

The update failed. Since then, every attempt to run the 1.10.8 installer results in a Windows Installer dialog saying:

“The feature you are trying to use is on a network resource that is unavailable.
Click OK to try again, or enter an alternate path to a folder containing the installation package ‘main.msi’.”

The requested path points to a temporary directory under:

C:\Users<username>\AppData\Local\Temp...

The referenced main.msi no longer exists.

Current state:

Bisq no longer appears in Windows “Apps & Features” / installed programs.
Reinstalling 1.10.7 is not possible because Bisq reports:
“Downgrade from version 1.10.8 to version 1.10.7 is not supported. Please use the current Bisq version.”
This suggests the data directory has already been migrated or marked as 1.10.8.
The official 1.10.8 installer is present and complete.
The 1.10.8 installer file size is about 438,763 KB.
The installer was downloaded from the official Bisq source.

Troubleshooting already performed:

Rebooted Windows.
Verified that Bisq does not appear in Windows Apps & Features.
Ran Microsoft “Program Install and Uninstall Troubleshooter” for both install and uninstall options; no result.
Checked:
C:\Program Files\Bisq → not present
C:\Program Files (x86)\Bisq → not present
Found these folders under %LOCALAPPDATA%:
Bisq-1.10.7
Bisq-old
Bisq-1.10.7 contained:
app
runtime
Bisq.exe
Bisq-old contained:
app
runtime
Both folders were renamed for testing, but the 1.10.8 installer still asks for missing main.msi.
Registry searches in the normal uninstall locations returned no Bisq entries:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
HKLM\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall
HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
Searching Windows Installer UserData showed many component references to:
Software\Bisq\Bisq\1.10.8\ProductCode
but no corresponding normal Product entry could be found.
Searches under:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData<user SID>\Products
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products
returned no Bisq product entry.
Tried /log with the 1.10.8 installer; no useful log output was produced.
Tried /layout; no layout folder or main.msi was created.

Additional information:

Bisq application data under %APPDATA%\Bisq has been fully backed up.
No trading has been done since the first security/update warning.
Bitcoin funds have been moved to a hardware wallet, so there are no funds at risk from waiting for a repair.

Question:
What is the recommended way to fully remove the broken Windows Installer / WiX state and perform a clean installation of Bisq 1.10.8 without deleting or corrupting the existing Bisq application data?

If needed, I can provide screenshots of the main.msi error and the relevant registry search results.!--
SUPPORT REQUESTS: This is for reporting bugs in the Bisq app.
If you have a support request, please join #support on Bisq's
Matrix Space over at https://bisq.chat

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