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Hi @Akhil raja rao K,

In further researching this issue, the installer hangs on the item "Installing Hasp Drivers", and Windows' Task Manager shows the Aladdin Hasp HL Driver Installer working hard to install the driver. Unfortunately, there is some incompatibility between this driver and Windows 10 that prevents the FlexSim installation from completing.

On my Windows 10 PC I installed an updated HASP driver (the linked driver also installs a Sentinel service which is not needed for FlexSim and can be disabled). The new driver successfully installed and works properly to enable my old FlexSim hardware key (the key lights up). However, despite having an updated HASP driver installed, FlexSim's 3.5.1 installer still fails on its attempt to install an older driver.

You have a few options:

1. I was able to install FlexSim 3.5.1 on an older system, then copy the installed files to my Windows 10 system. The application file Flexsim3\program\flexsimrunner.exe can start the program, though if you have an Nvidia graphics card it will immediately crash. If this applies to you, first run Flexsim3\program\flexsimgfx.exe (right click and choose Run as Administrator). Set Common Configurations to High Compatibility. Also, FlexSim 3.5.1 requires a compiler - an old version of Visual Studio (2003, maybe 2005?) - which I don't know if it will work with Windows 10 and didn't test. Finally, I was not able to get my HASP key to properly license FlexSim 3.5.1 (despite it working properly to license newer FlexSim versions like 4.0.1 - more on that soon). For these reasons, I think that it is unlikely that you will be able to successfully run a full version of FlexSim 3.5.1 on Windows 10 - they are just too far apart in time to overcome the missing dependencies of compiling and licensing.
2. Given that successfully running on Windows 10 is very unlikely, you may wish to maintain a virtual machine with Windows 7 or older OS. FlexSim 3.5.1, the Visual Studio .NET compiler, and licensing *may* work, though I don't know how you would map your hardware USB key for use in the VM. You'd have to research online, and I did not attempt this option. I'm skeptical that it could function well enough to be of use.
3. The best option is to upgrade to FlexSim 4.0.1, which is the next available installer after 3.5.1 - so just a single upgrade step. Your model file should upgrade properly from 3.5 to 4.0, so this could be a valid solution for you. On Windows 10 I was able to run the 4.0.1 installer without errors, run the software (after using flexsimgfx.exe to set graphics to High Compatibility), and even license the software with my old hardware USB HASP key (and the latest Sentinel HASP driver, linked above). Your old FlexSim 3.5 model would still require a compiler (which again, not sure about compatibility between Visual Studio 2003/2005 and Windows 10), but any new models built with FlexSim 4.0.1 can use FlexScript and avoid needing to be compiled.

Sorry for the trouble with FlexSim 3.5, but I'm sure you can appreciate that after 14 years we can't update the 3.5.1 installer and Windows can't be expected to support drivers, compilers, and software that are so old and built for 32-bit versions of Windows that have been out of support for many years. Hopefully version 4.0.1 will work for you.

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