Legally, for free, without SMS.
Tested and works on the latest version 3.4.2 (win)
1. Options> Preferences> Advanced
2. Set the parameters “sponsored_torrent_offer_enabled” and “gui.show_plus_upsell” to “false”
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3. Click "OK" and restart the program.
That's all folks! Now the program window looks like this:

On health.
UPD: a more extensive list of options is offered in the folders.