Open your CAD application and type the APPLOAD command (or a similar command depending on the CAD application you are using). When the Load/Unload Application window opens, select the ProfLT.lsp file (by default you can find it in C:\Program Files\ProfLT) and press the Load button.
After the program loads you should receive the message "ProfLT.lsp successfully loaded". Press the Close button.

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