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Installation Installation, licensing and hardware issues

Old 09-08-2015
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Default FlexSim installation or startup error

When installing FlexSim, has the installer ever quit, saying "Installation Cancelled" or "FlexSim must close"?

Or has your FlexSim installation ever had errors upon starting the software?
FlexSim has encountered a problem. Please notify [email protected] about this. Retrieve your recovery files, then email FlexSim. Do you want to restart?
This can be frustrating any time, let alone for a brand new FlexSim installation.

Here are some possible solutions that may help FlexSim install or start properly:

  1. Ensure that you have the proper privileges on your PC such that you can install new software.
  2. Make sure your computer is up to date with Windows updates and drivers. Especially be sure to upgrade graphics drivers, as FlexSim relies on fixes and features found in the latest graphics drivers from NVIDIA, Intel, or AMD. See this thread for more graphics considerations.
  3. Update your computer's .NET installation to at least version 4.5.2. After installing any new .NET framework, please revisit #2 above and run Microsoft Update again. There are often new security fixes that should be applied to your .NET installation.
    Here is a link to the .NET 4.6.1 upgrade:
  4. Sometimes when FlexSim has trouble starting up, it can be due to a corrupted prefs.t file. FlexSim's prefs.t file stores your FlexSim settings and preferences and is located at:
    The %APPDATA% address is a shortcut to your Windows user account's Roaming directory. This video illustrates usage of this path:
    With FlexSim closed, please delete this prefs.t file. Then try starting FlexSim. Are the problems resolved?
  5. Completely uninstall FlexSim and try a new install. It may be worth downloading a new copy of the full installer to ensure there was no corruption in the install package. Be sure to right-click the installer and choose to Run As Administrator, and/or be logged in as a user with full admin privileges.
  6. If FlexSim still won't install or start, try checking the Windows Event Viewer to see if there are any errors related to attempting to start FlexSim. If so, please send those our way so that we can troubleshoot further.
    Here is a tutorial about the Event Viewer, in case you've never used it before:

Please let us know below if any of the solutions above fix the problem, or if you find a different solution. That will help us to improve our troubleshooting steps.

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Last edited by Ben Wilson; 02-05-2016 at 12:15 PM.
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.net, driver, error, installation, prefs.t, problem, recovery, start-up, startup, update

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