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:
name=email=regcode
e.g.
msiexec /i AgentRansack_x64_3335.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>
<name></name>
<email></email>
<regcode></regcode>
</reg>
And so using the information from your registration email should look something like:
<reg>
<name>Abc Widgets Corp</name>
<email>admin@abcwidgets.com</email>
<regcode>a368de61...</regcode>
</reg>
Important: If your registration details show just a 'First name' and 'Last name' combine the two to create a single name. e.g.
First name: Abc Widgets
Last name: Corp
translates to:
Name: Abc Widgets Corp