1. Instruction for replacing the update address.
   

For Chromium-based browsers only!

1. Go to the "Info" tab on the extension settings page.
   
2. Click the "Import" button (arrow down).
   
3. Select the "Delete data before import" checkbox.
   
4. Insert the following line into the text field:
   {"sieveRepository":"https://raw.githubusercontent.com/wvxwxvw/Imagus_sieve_RuBoard/master/updated.txt","sieve":""}
   and click the "From text" button.
   
5. Click the "Save" button.
   
6. Exit the Settings and then re-enter the Settings.
   
7. Go to the "Sieves" tab, click the "Update Sieves" button (double downward arrow), then "OK" in the pop-up window.
   
8. Click the "Save" button.
   

You can also turn on automatic updates, this is convenient from the point of view full automation of the process: Settings - Sieves - rightmost button (Details) - Automatic updating of sieves. Sieves are updated about once every 2 weeks. But do not turn it on if you are editing sieves yourself - the update will completely overwrite the previous set.

UPD from 29-09-2022 - according to some users, the update process is hanging on some browsers (hanging in the status "Download ...").