The SIMFLEX family of pipe stress analysis programs uses Sentinel hardware keys to control licensing. Most security issues are a result of an outdated Sentinel System Driver.

The latest Sentinel driver can be obtained below. This version is for Win95/98/ME/NT/2000/XP.

Sentinel System Driver v.5.392 - Install Version - 3.36MB

Instructions:

Unzip the file after downloading and run the EXE file. Follow the prompts to install the latest security drivers.