After three of my Windows 10 x64 computers updated with
KB4532693 (OS Builds 18362.657 and 18363.657)
KB4534132 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 10 Version 1903 and Windows Server 1903 RTM and Windows 10 , version 1909 and Windows Server, version 1909
KB4537759 Security Update for Adobe Flash Player: February 11, 2020
Syncthing couldn’t start with the message “Unable to start Syncthing: RestEase Error.”:
I had syncthing v1.1.1 "Erbium Earthworm" (go1.12.1 windows-amd64) teamcity@build.syncthing.net 2019-03-25 11:43:21 UTC and putting the newest version of syncthing.exe into the SyncTrayzor folder made it work again.
A test maybe is good. Starting Syncthing without SyncTrayzor offers a result. The same updates I also made on Windows 10 without any problems.
Generally I use Syncthing without SyncTrayzor with the Task Scheduler:
Start the Task Scheduler (taskschd.msc)
Create a New Task (“Action” menu -> “Create Task…”)
General Tab:
Name the task (for example ‘Syncthing’)
Check “Run whether user is logged on or not”
Triggers Tab:
Click “New…”
Set “Begin the task” to “At Startup”
(optional) choose a delay
Make sure Enabled is checked
Click “OK”
Actions Tab:
Click “New…”
[Action] should be set as “Start a program”
Enter the path to syncthing.exe in “Program/Script”
(optional) Enter “-no-console -no-browser” for “Add arguments (optional)”
Click “OK”
Settings Tab:
(recommended) Keep the checkbox on “Allow task to be run on demand”
Clear checkbox from “Stop task if it runs longer than:”
(recommended) Keep “Do not start a new instance” for “If the task is already running, then the following rule applies”
Click OK
Enter password for the user.