The Custom installer service is not supported in Remote Desktop Manager macOS. The alternative would be to copy the CFG file and manually distribute it to the right folder.
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In Remote Desktop Manager, click on File – Devolutions Account – Sign-in if an account is not already logged in.

File – – Sign-in -
Under Tools, click on custom installer manager.

File – Devolutions Account – Custom installer manager -
Set a Version and Name for the configuration.

Version and name -
If desired, choose to encrypt the configuration with a password in the installer package.

Encrypt configuration with password in the installer package -
Create a configuration just for this package or use an existing Remote Desktop Installer (RDI) file.
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Select Create a configuration just for this package, then click Create.

Create a configuration just for this package -
See our RDI file generation options guide for more information about the different options to choose from. When done, click on Export.

Configuration options -
When prompted, save the installation package file locally.
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Select Use existing Remote Desktop Installer (rdi) file.

Use existing Remote Desktop Installer (rdi) file -
In the Output filename, either:
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Search for an existing local RDI file; or
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Create one by exporting the configuration from a data source. See our RDI file generation options guide for more information about the different options to choose from. When done, click on Export.

Configuration options
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Click Create.

Create the custom installation package -
When prompted, save the installation package file locally.
The Custom installer manager can be used with endpoint management solutions such as Microsoft Intune, Microsoft Configuration Manager (SCCM), or other deployment platforms.
By generating a Custom installer that includes the required Remote Desktop Manager configuration, administrators can distribute it through their endpoint management solution to multiple devices. This allows organizations to deploy Remote Desktop Manager at scale while ensuring users receive a predefined configuration upon installation.
See Deploy Remote Desktop Manager using Intune for more details.