Please, pay attention to the online documentation, its pretty much broken:
http://manual.reallusion.com/iClone/script/python/index.html
For example navigate to anything under Modules -> System

You don't really "install" the dev version.

You extract the ZIP file which gives you a Python_API_073_for_iClone_741 directory tree, which you then place under C:\Program Files\Reallusion. Then run iClone.exe from there.

You will have to change your PATH to point to the alternate Python locations: C:\Program Files\Reallusion\Python_API_073\Bin64 and C:\Program Files\Reallusion\Python_API_073\Bin64\scripts.

The Dev version is much more extensive and should have the file version 7.41.2824.1 (right-click iClone.exe and check Properties>Details), although Help>About says 7.41.2627.1. Go figure... :unsure:

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76% of original size (was 661x19) - Click to enlarge

As the developer version is a stand alone version. You should just be able to install it. It won't overwrite the existing standard version.

My guess is that the developer version may have some new features from the next release of iclone.

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iClone 7, 3DXchange 7 Pipeline, CC3 Pipeline, CT8 Pipeline, Iray, Live Face, iPhone Xr, Win 10, i9 9900K ~5GHz, Nvidia RTX 2080 8GB, 16GB Ram, M.2 SSD

Dear Developers,

iClone Developer Edition 0.7.4 is Available Now!

Please download from HERE

Add:

• Viseme related API.
• HIK Effector related API.

Fix:

• Retrieved prop quaternion not converting to degrees.

                                                          
Tony
Product Marketing Manager 

www.reallusion.com

How to use RLPy.RGlobal.TrialVersionRemainingDays(strBinPath,uProductID,strProductFold) for the marketplace.

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iClone 7, 3DXchange 7 Pipeline, CC3 Pipeline, CT8 Pipeline, Iray, Live Face, iPhone Xr, Win 10, i9 9900K ~5GHz, Nvidia RTX 2080 8GB, 16GB Ram, M.2 SSD

A more commented version how to use the mocap manager. The example https://github.com/reallusion/iClone/tree/master/HandGesturesPuppeteering is not commented and is mixed with other features in the API. It would be nice to only cover the mocap manager and how to use it.

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iClone 7, 3DXchange 7 Pipeline, CC3 Pipeline, CT8 Pipeline, Iray, Live Face, iPhone Xr, Win 10, i9 9900K ~5GHz, Nvidia RTX 2080 8GB, 16GB Ram, M.2 SSD

I should mention I am mostly interested in get/set local and world quaternions for bones in avatars.

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iClone 7, 3DXchange 7 Pipeline, CC3 Pipeline, CT8 Pipeline, Iray, Live Face, iPhone Xr, Win 10, i9 9900K ~5GHz, Nvidia RTX 2080 8GB, 16GB Ram, M.2 SSD