how to upload the user define compounds and the database for the TBC; I change their extension to the .DWSIM but still I am not able to upload the file.
And how can I attach different subproblem which requires a different input parameter in only one file, I am also not able to upload the .zip file
You neednot upload the user define compounds in TBC. Once the compounds are added to the flowsheet, they should work fine in any machine which doesnt have the user defined compound uploaded as long as they are available in the flowsheet.
You can upload the subparts as another file. For example, if Ex5.3 has two subparts as (a) and (b), solve both of them individually and save as separate files. Name the files as Ex5_3_a.dwxml and Ex5_3_b.dwxml and upload them separately.