I have downloaded FME 2020 software into my D drive and I have moved my FME 2020 Data into my D Drive as well. So I started with exercise 1.1 Begin but every time I hit the "RUN" button, I would get errors saying "Cannot open dataset `C:\\FMEData2020\\Data\\Boundaries\\LocalAreas.kml' because it keep reading it from the C drive, so how do I get it to read it from the D drive cos I have already moved the FMEData2020 into the D drive. The reason for moving is I don't have much space in my C drive. Any suggestions, please?
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To edit a Reader select it and click the magenta sprocket. That pops-up a window in which you can browse to the dataset you need to read.
Writers have a similar setting. At least some of them. You will discover further along that some writers are different from others.
To edit a Reader select it and click the magenta sprocket. That pops-up a window in which you can browse to the dataset you need to read.
Writers have a similar setting. At least some of them. You will discover further along that some writers are different from others.
I have done as you suggested and it hasn't fixed the issue. The errors would pop up saying " Coordinate system of reader identified by keyword `OGCKML_1' has changed from `LL84' to `'
CSV reader: Failed to open file 'C:\\FMEData2020\\Resources\\311\\311-summary.csv' for reading. Please ensure that the file exists and you have sufficient privileges to read it
CSV reader: Failed to open file 'C:\\FMEData2020\\Resources\\311\\311-summary.csv' for reading. Please ensure that the file exists and you have sufficient privileges to read it
A fatal error has occurred. Check the logfile above for details
During translation, some features were read that did not match a reader feature type in the workspace. This can happen if the reader dataset is changed, or a reader feature type removed or renamed.." I am a little lost as to why it keeps going back to the C drive. Any more suggestions to fix it, please? 
I have done as you suggested and it hasn't fixed the issue. The errors would pop up saying " Coordinate system of reader identified by keyword `OGCKML_1' has changed from `LL84' to `'
CSV reader: Failed to open file 'C:\\FMEData2020\\Resources\\311\\311-summary.csv' for reading. Please ensure that the file exists and you have sufficient privileges to read it
CSV reader: Failed to open file 'C:\\FMEData2020\\Resources\\311\\311-summary.csv' for reading. Please ensure that the file exists and you have sufficient privileges to read it
A fatal error has occurred. Check the logfile above for details
During translation, some features were read that did not match a reader feature type in the workspace. This can happen if the reader dataset is changed, or a reader feature type removed or renamed.." I am a little lost as to why it keeps going back to the C drive. Any more suggestions to fix it, please?
@melvanenter try to re-add all of your inputs (by drag and drop), and then connect them to the right transformers. Then delete all your previous inputs (the ones who always failed). And try to re-run your workspace. Maybe it's just a problem related to the cache (you're actually using FME with the feature caching, and it can be a problem if you moved your data).