Hello,
if you have a look on the CODESYS Store (https://store.codesys.com/de/codesys-git.html) you can see, that CODESYS 3.5.18.20 is needed to run the version CODESYS Git 1.2.1.0. here you need ctrlX WORKs 1.18 or higher.
Alternatively you can download CODESYS Git 1.1.0.0 to install it on ctrlX PLC Engineering 1.12.
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