After installation, go into PowerISO settings and enable "Mount via right-click." Now you can double-click an ISO, or right-click it in File Explorer and select "Mount to drive X:" without opening the main program.
While there are no official, current "giveaways" for a from the developer, the software is available through several legitimate channels. PowerISO typically follows a one-time purchase model for its full features. Official Licensing & Pricing
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The prize for this giveaway is a lifetime license of PowerISO 6, which includes: