Why is this prompt looking at ProgramData?
lf.licx files belong in ProgramFiles
Forms change the license location in 10.4 to support the auto-relicensing feature via Directory Server, as stated in the release notes
Automatic Re-licensing with Directory Server
Laserfiche Directory Server 10.4 supports alerting Forms when it has an updated master license. Forms can now automatically replace its application license when it receives a notification from Directory Server.
For situations where Forms is not running and misses the notification, the Forms Configuration site now includes "Automatically check LFDS for updated license daily and on application start" to ensure you never miss an update.
Note: The location of the Forms license is now in C:\ProgramData\Laserfiche Forms\License. You must recycle the FormsAppPool IIS application pool if you replace lf.licx manually.
You can find the information for all license locations (including version-specific changes) in KB 1000988