Wrong host error messageThis error message is usually followed by a second message that indicates your license will be deactivated (revoked). The error is caused by one of these issues with the license file (extendsim.lic):

There is more than one installation of the same ExtendSim product on this device and the license file (extendsim.lic) doesn’t recognize the ExtendSim application that got launched as being the one that was activated. This happens if:

You used a Trial license as an updater, but it didn’t replace your existing ExtendSim files. Instead, it is a separate installation.

There is an installation of ExtendSim in your account on this device and also in the account of someone else, such as a colleague or an IT or Admin. (If you want multiple users on one device, you must purchase a Node-Locked license.)

You also installed ExtendSim to Microsoft OneDrive, or you have copied your installation files to OneDrive.

You were beta testing ExtendSim and didn’t properly uninstall your beta version.

Your device has been significantly altered such that the license's HostID information is no longer valid. This is common if the hard drive has been replaced or the computer was wiped clean prior to installing a new operating system.

The license file is not the correct one for your device. This happens if your license file was replaced by the license file for a different device, for example if you copied files (including the extendsim.lic file) from one device to another.

To fix:

If the issue was due to a duplicate installation, locate and uninstall those extra installations. Look in Windows Settings or Control Panel for ExtendSim and search Documents folders (including OneDrive). Then remove the duplicate installations.

If the issue is due to a reformatted or replaced hard drive, you will need to activate again. Restart ExtendSim and enter your Activation Key in the Activation Dialog. Activation will only be automatic if you have previously revoked the license; otherwise it will be manual.

If the issue occurred because your license was replaced by someone else’s license file, find your backup license file named extendsim.lic.bak (by default it should be in your Documents\ExtendSim10 folder). Then remove the .bak extension and restart ExtendSim. ExtendSim will be activated again using your original license file.