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Unfortunately, software development never happens without bugs. Understanding that we continue development of X-Cart and release its new versions once a quarter approximately and you as an owner of an X-Cart v4.x license has free life-time access to new versions of X-Cart v4.x as well as to upgrade packs that we release to make upgrade process easier for X-Cart merchants and developers. You do not need to pay to download and start using X-Cart 4.6.1 or X-Cart 4.6.2. Access to new X-Cart v4 versions is included in your license you paid for.