FreeFileSync Forum

But I couldn't find the part handling this "install.dat" in source code
This part is handled in the installer, which is not open source. As for the installation failure, is this still reproducible? If yes, I'd like to analyze what's going on.
No. The creation part could be in installer. But the ...

updated the installation file a minute ago and refuse to admit it.
record (or collect?) user's information
Jesus, ayuanx... yes, the 8.0 release was updated (twice!) to fix small showstopper bugs during the installation. These bugfixes don't affect users who have already installed 8.0 with ...

Just for the record, I don't know what you are trying to hide, but apparently you secretly added some code to record (or collect?) user's information. What exactly it is for, we have no idea yet.
Because for this part of the code, you deliberately hid it and did not put into the source code you ...

No, unfortunately that's not the case here.
Any fresh installation selecting portable checkbox won't have "install.dat" file.
You may test it yourself. (Make sure you don't have any existing installation on the computer).
When you close the FFS installation dialog, the file will be created ...

This is related to the installation consistency checks that are now included. FreeFileSync will test during startup if any data corruption occured to the installed files.

Portable usage should still continue to work if you install on an USB stick directly and move it between different computers ...

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FreeFileSync - An exception occurred
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Installation files are corrupt. Please reinstall FreeFileSync.

Cannot open file "B:\abc\install.dat".

Error Code 2: The system cannot find the file specified. (CreateFile)
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OK ...

When choosing a directory from the drop-down list on the left, it would be
quite convenient if the drop-down list on the right could automatically select
the corresponding directory which was paired with the directory on the left in
previous synchronization.

A very simple feature but essentially ...