I didn't pay attention to the synchronization update, transferred the token to the bittrex.com network, and showed that it has been successful. But bittrex.com network has not received the token. It may not be updated synchronously. So I am eager to find a solution now.
This happens sometimes when executables are zipped, I don't know why, but their content type changes to .so. Is there a button to run it in a terminal? If so, please click that and put the output here.
If that doesn't work you can right-click the directory where sia-ui is in and choose "Open in Terminal", then in the terminal window type ./Sia-UI and it should start.
I deleted all the SIA-UI directories and the stuff in \AppData\Roaming\Sia-UI\sia
then downloaded version 1.1.0 of the Sia-UI.
It started synchronizing almost straight away.
Once done, I'll upgrade version 1.3.0 all being well.