With the "batch convert ISO image files" option in Free WinISO Maker, you will be freed from the burden of converting files one by one.
Please Download and install Free WinISO Maker>>
First download and install Free WinISO Maker on your PC, and run Free WinISO Maker. The main menu window should appear.
Click "Batch Images Convert" on the convert menu .
Choose the source files you wish to convert to one ISO file or folder, then click "Convert" to begin batch converting ISO image files.
After the "Now converting" dialog box reaches 100% completion, your selected files should be batch converted and ready for use.
For more guides, please take closer look here: