Official support for legacy Seiki plotters can be fragmented, but you can typically find the necessary files through the following reliable channels:
Seiki no longer hosts it. Here's the workaround: ✅ Windows Update installs it automatically as "Generic PnP Monitor" ✅ Need the .INF? Try archived driver repos (use at your own risk) ❌ Avoid third-party "driver booster" apps – they're scams.
Avoid "driver updater" software. They will not have the authentic Seiki 870T driver.