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One Click Upgrade 4.15.0.: It's not possible to create a PHP session and no new version available. · Issue #30658 · PrestaShop/PrestaShop · GitHub
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1-Click Upgrade not even available to download? - Upgrading PrestaShop from a previous version - PrestaShop Forums
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1.6.1.17 to 1.7.x Problem with 1 click upgrade module - Upgrading PrestaShop from a previous version - PrestaShop Forums
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1.6.1.17 to 1.7.x Problem with 1 click upgrade module - Upgrading PrestaShop from a previous version - PrestaShop Forums
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Upgrade with 1-click from 1.6.1.17 to 1.7.x - Upgrading PrestaShop from a previous version - PrestaShop Forums
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