Hello to Everyone.

Same thing I faced last week. actually, at that time, I don't have the correct version of software in PC and tried to upload from CPU, but it did not happen, 

on next day, I installed correct version TIA V15.1 and went to the online because having latest backup but inside backup one FC was mismatched and not allowed to upload this FC from Controller.

So, can you suggest, what was the issue?

Kindly find the Attached Scree.

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Split from Program upload with different TIA Portal versions.