PaperScan doesn't need administrator rights to work flawlessly.
You can use it on different windows accounts as far as it is the same computer.
However, if your own settings block the use of PaperScan, I suggest that you check your antivirus and/or firewall and add some exception rules.
You can also try a right-click on PaperScan and select "Run as administrator".
Note that you don't need to register a Trial or Free edition (except for evaluation key), only a commercial edition.
Please, do not hesitate to let us know if you have any further questions or need more information.
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