Yes, the MSI files to install Agent Ransack or FileLocator Lite in unattended/silent install mode are available on the download page:
https://www.mythicsoft.com/agentransack/download/
The MSI files are self contained and support all the msiexec switches, such as
/quiet
Quiet mode, no user interaction
/passive
Unattended mode - progress bar only
/q[n|b|r|f]
Sets user interface level
n - No UI
b - Basic UI
r - Reduced UI
f - Full UI (default)
Supporter's license
If you do not wish for your end-users to be presented with the 'License Type' dialog you need a Business or Enterprise Supporter's license.

By purchasing a supporter's license you help Mythicsoft cover the cost of supporting and developing the product. It's a small price to pay for something that obviously adds value.
A supporter's license can be purchased here:
Agent Ransack - Registration
FileLocator Lite - Registration
Note: FileLocator Lite and Agent Ransack use the same registration code scheme and so can be used interchangeably.
More information
When deploying Agent Ransack in a business environment there are two methods to distribute the registration information during the install:
1. Using the REG_DETAILS property
The REG_DETAILS property is an '=' separated list of registration information in the format firstname=lastname=email=regcode, e.g.
msiexec /i AgentRansack_x64_820.msi REG_DETAILS="Abc Widgets=Corp=admin@abcwidgets.com=a368d..."
2. Using an install_reg.xml file
If you add a file called install_reg.xml (or flpro_reg.xml) in the source folder (ie same folder as MSI) the installer will read that and apply it to the install. The format for the file is:
<reg>
<firstname></firstname>
<lastname></lastname>
<email></email>
<regcode></regcode>
</reg>
And so using the information from your registration email should look something like:
<reg>
<firstname>Abc Widgets</firstname>
<lastname>Corp</lastname>
<email>admin@abcwidgets.com</email>
<regcode>a368de61...</regcode>
</reg>
Important: If your registration details show just a single 'Name' value you'll need to break that down into two separate values, 'First name' and 'Last name'. Simply take the last name as the very last group of characters, e.g.
Name: Abc Widgets Corp
translates to:
First name: Abc Widgets
Last name: Corp