I have the same problem. I bought roundcourner and i can't activate license.

Fredo6 Plugins Information on 2025-08-21 14:47:11 +0200

• Platform: x64-mingw32 - Ruby: 2.5.5
• Sketchup: 20.2.172
• LibFredo6: v15.4d
• LibFredo6 Binary loaded
• Sketchucation ExtensionStore: 4.4.1
• SCFLicense: v6.4a - 74
• Fredo6 Plugins

  Curviloft v1.8a
  FredoScale v3.1a
  FredoTools v4.0b
  JointPushPull v4.4e
  RoundCorner v3.4a

• SCFLicense directory present

  Signature File: 2020-11-03 19:38:01 +0100
  ClothWorks: 2021-02-02 11:29:08 +0100