The specified folder is invalid. It contains spaces or illegal characters. - The specified folder is invalid. It contains spaces or illegal characters. Description You may see this error when installing the Quartus® II software versions 9.1 and later. Altera only supports standard alphanumeric characters and underscores (_) in installation paths for all design tools from the Altera® Complete Design Suite (ACDS). A symbol such as the underscore (_) can be used as a place holder instead of spaces. For example, use "My_Folder" instead of "My Folder". Examples of unsupported characters: \/:*?"<>|!£$%^&() Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']