Remote Desktop Manager for macOS does not support the custom installer. The alternative would be to export a Default.cfg file and apply it to new installations.
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In Remote Desktop Manager, head to Tools – All tools, and execute the Custom installer manager tool.
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Then, select Generate custom installer.
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Choose whether to Download MSI from the web or Use pre-downloaded MSI.
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Set a Version and Name for the configuration.
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If desired, choose to encrypt the configuration with a password in the installer package.
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Create a configuration just for this package or use an existing Remote Desktop Installer (RDI) file.

Select Create a configuration just for this package, then click Create.
See RDI file generation options for more information about the different options to choose from. When done, click on Export.
When prompted, save the installation package file locally.
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Select Use existing Remote Desktop Installer (rdi) file.

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In the Output filename, either:
Search for an existing local RDI file; or
Create one by exporting the configuration from a workspace. See our RDI file generation options guide for more information about the different options to choose from. When done, click on Export.
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Click Create.

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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.