Taken from the iMesh FAQ
Error Message: "Unable to find install.log"
You may be receiving this message when uninstalling iMesh. It is usually
caused by multiple installs and uninstalls due to troubleshooting and
other random fiddling.
This is probably the easiest to solve problem though, so not to worry:
This error occurs during the uninstall process, and causes the uninstall to fail.
First open iMesh, click File, and then click Exit. This will make sure that iMesh is completely shut down before proceeding.
Next, instead of uninstalling, go to the www.iMesh.com homepage, and
install the latest version of iMesh by downloading iMesh. This will
overwrite the one that you presently have installed.
When completing the iMesh installation, uncheck the run iMesh now option, and then click Finish.
Now that that's done, you may proceed to uninstalling iMesh from the
Windows Control Panel as previously attempted, and it should
successfully uninstall this time.