SelekTOR for Linux development has now ceased, there will be one more release of SelekTOR for Linux in order to remove the Patreon functionality but no future work is planned.
The Patreon page will be shutdown on the release of the final SelekTOR for Linux, for now the Patreon account has been paused and no charges will be made.
The SelekTOR for Windows release will continue to be developed and will receive bug fix updates for the foreseeable future.
SelekTOR 4 for Windows is in development (still a long way off from completion) and will only be available on that platform. If their is enough interest a commercial Linux version may be released but obviously wont be open source.