English translation:

Copy the com.adamsacks.rectcontrol folder to the following location:

Windows:
C:\Program Files (x86)\Common Files\Adobe\CEP\extensions\

Mac:
/Library/Application Support/Adobe/CEP/extensions

Run the following installer file:
Windows: Add Keys.reg
Mac: install-as-admin

Open After Effects preferences and enable Allow Scripts to Write Files and Access Network.

For older AE versions:

Windows: Edit ? Preferences ? General
Mac: After Effects CC ? Preferences ? General

For AE CC 2019.1 or later:

Windows: Edit ? Preferences ? Scripting & Expressions
Mac: After Effects CC ? Preferences ? Scripting & Expressions

Launch After Effects, then go to:

Window ? Extensions ? RectControl

to open the RectControl extension.

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