Můžeš zkusit PDF Architect Removal Tool.
https://download.pdfforge.org/go/pdfarchitect9/remover/9.0.11.68/PDFArchitectRemovalTool.exe
Popis odinstalace zde:
https://support.pdfarchitect.org/hc/en-us/articles/360022312192-How-to-Uninstall-PDF-Architect