Transmission

viewtopic.php?f=4&t=10469
This is a similar thread.
Transmission will Seed Forever, if it has exceeded the specified share ratio when the download reaches 100%

Yes. In Preferences > Transfers > Management > Queues:
checked - Download with maximum of 1 active transfers
checked - Seeding with maximum of 1 active transfers

Negative on clicking the Resume button.

If I have a "stop seeding at share ratio" set, and throttle my download speed, it's sometimes possible that the torrent has already exceeded the "stop seeding at share ratio" setting when the download reaches 100% and seeding begins. If so, then the torrent ...

My per-torrent seeding setting is set for "Global Settings".

While observing downloads, it seems that if the Share Ratio setting is exceeded, at the time the download completes and the torrent starts seeding, then it will seed forever rather that stop. The version I am using is 2.04 for Mac