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That worked thanks for the help.

I believe my problem comes from when I installed the following by accident. DL 2022 16.0.0 build 501 then I installed the following but did not uninstall 2022. I have InstaCal = 6.73, installed on a Windows 10 pro, with DL 2020, 15.0.0, build 339. as a runtime system which matches my DL 2020 Pro. programing environment. Net framework installed, 3.5 and 4.8 Also see attached. Let me know what you think. Hopefully I have answered most of your questions. Thanks for the help.

Hello, I have installed DL 2020 and the folder "MCC-DRV" is missing in the input/ output tree. I have it checked in the configurator. This has happened to me several years ago, but I have forgot how to remedy the problem. Thanks, in advance.

Hello, I have a full license and several PC's running on a runtime license, often I will swap out the run time with my full license to make changes on the fly and then change them back. Recently I have deployed a new test system to another PC with a new run time license and when I tried to swap out the run time license. with my full license I get an error as follows. " Error: invalid serial number, the specified serial number is not valid for the installed version. " Have I downloaded the wrong version of DL? or has there been a change made regarding licensees? Thanks