Several questions about v1/v2 files mixing

[lucidBrot]

Syncthing and Synctrayzor were working fine for me until now. Today I've finally given in and agreed to upgrade to 2.1.0.

After upgrade, it was no longer running, so I started SyncTrayzor again. And was greeted with a warning that there are mixed v1 and v2 files that cause crashes. And sure enough, now synctrayzor crashes when I start it. But that did not happen before.

Warn users if a mixed v1/v2 install is detected. These installs contain files from SyncTrayzor v1, which are incompatible with SyncTrayzor v2 and cause frequent crashes.

Release 2.1.0 introduced the warning, according to the release notes.

• But did the new version perhaps also introduce the issue?

After running into that crash, the next start of SyncTrayzor complained about an already-running syncthing. Which was true, as my other devices reported the PC as online. I did not find it in Task Manager though, nor in the tray bar. So I killed it by using the option in SyncTrayzor's menu to kill all syncthing processes.

After that, everything is now working again. Except that when I close SyncTrayzor and open it again, I get that popup about the v1/v2 mixing. This can get annyoing.

I would appreciate some more detailed guidance in there, how to perform this cleanup in the least-disrupting way. I'm hoping I can reuse the syncthing data without setting up everything fresh. But I don't think I am using the portable version, and I don't know where the data folder is.

• How do I keep user data if I am not using the portable version?

Finally, I feel like the popup might not even be so relevant in my case, as it is now no longer crashing again. The only crash was the first time I started synctrayzor after upgrading.

• How can I tell whether there really is anything broken that needs my attention?

---

I'm attaching the logfile. While it spans the whole times from the upgrade to now, I doubt it contains much useful information though. The stack trace doesn't really say much.

SyncTrayzor.log

---

Thank you for maintaining!

[GermanCoding]

SyncTrayzor v1 has translation files that are not supported by SyncTrayzor v2 due to a major dependency upgrade of SmartFormat. However, the filenames are still the same, so v2 will read the localization files from v1 and then crash when trying to display them (if that localization is in use, this mainly affects languages where SyncTrayzor v2 has poor coverage). This is currently the primary known cause as to why mixed v1/v2 installs often crash. An installation only containing SyncTrayzor v2 only has localizations that are compatible (it will revert to English if your system locale is not translated).

How did you upgrade from SyncTrayzor v1 to v2? Did you use the SyncTrayzorSetup-x64.exe installer? That installer is supposed to auto-remove v1 files upon upgrade to v2. If the warning appears, then that means that this didn't work for some reason. I've had user reports in the past that indicates that this may be happening on some systems, but I've no idea why or how to reproduce this. The installer should also stop syncthing during that upgrade, so if syncthing is already running then that indicates that something went really wrong during the v1 -> v2 upgrade path.

Once this mixed-files setup has appeared, the only good solution is to wipe the SyncTrayzor installation directory (on your system F:\Programme\Programme\SyncTrayzor\) and re-install v2. For the installed (non-portable) version, your syncthing configuration and database are stored in a different directory and are not affected by this. You should also be able to uninstall SyncTrayzor through Windows Add or Remove programs settings menu. When using that option the uninstaller will ask whether it should wipe your syncthing data/configuration. Be sure to select NO here to keep your data. Then just re-run the installer.

[lucidBrot]

The installer should also stop syncthing during that upgrade, so if syncthing is already running then that indicates that something went really wrong during the v1 -> v2 upgrade path.

You should also be able to uninstall SyncTrayzor through Windows Add or Remove programs settings menu. When using that option the uninstaller will ask whether it should wipe your syncthing data/configuration. Be sure to select NO here to keep your data. Then just re-run the installer.

Perfect! Then I would just suggest to include this info in the popup :)

How did you upgrade from SyncTrayzor v1 to v2?

To be clear, I was already on v2 now (with no crashes), although not sure what version exactly.
I upgraded to v2 on the 7th of October 2025, at least that's what the timestamp says of the SyncTrayzorSetup-x64.exe that is still lying in my Downloads folder.

(My memory is not great on this, but I vaguely recall that there was some oddity during the upgrade, where I noticed I now had two installations in different locations, and then I just deleted one. But that may have been some completely different application. As I said, I have no clear recollection.)

I've had user reports in the past that indicates that this may be happening on some systems, but I've no idea why or how to reproduce this.

Blind guess, but one unusual thing about my setup is that I have multiple hard drives, and don't usually install programs in C:.

it will revert to English if your system locale is not translated)

Fyi my system is win10, set to german (switzerland) and syncTrayzor is set to german too. I think this means I'll be fine ignoring the popup for now (i know, I should reinstall it, lest I open issues again :D )

[GermanCoding]

Yeah you likely had the mixed files for a while already, but you didn't notice because your localization isn't affected by the crashes. I can't guarantee that everything else behaves as expected though, so I'm fine with the program still nagging you about this scenario until it's fixed 😄. Previous versions didn't warn explicitly.

The different drive and multiple installations sounds interesting, possibly the upgrader uninstalled the wrong SyncTrayzor on upgrade if there somehow where two installations initially. It assumes that there can only be one SyncTrayzor installation on a given system, which may not always be correct? In that case your registry keys will also likely be pretty messed up, so a clean install would be best.

[lucidBrot]

Thanks for your inputs!

If you like, you can close this issue - or keep it as a task to add some more info to the popup, so others won't wonder the same as I did.

In case any other issue crops up, or the crashes occur again, I will do a clean reinstall. Otherwise... we'll see whether I dare fix a running system X)