Some old Ulead versions allowed a 30-day trial without a serial. If you still have the installer, try installing and see if it still runs. (But again, online activation is likely dead.)
"Plus" added high-definition MPEG-2 and MPEG-4 support, plus more effects. At the time, it retailed for around $99–$129 USD. serial number ulead video studio 11 plus
One 2022 analysis of “Ulead VideoStudio 11 serial keygen” downloads on public torrent sites showed that (per VirusTotal). Some old Ulead versions allowed a 30-day trial
Don't let nostalgia or frustration lead you into piracy and malware. Modern video editing is easier, faster, and safer than ever – legally. plus more effects. At the time