upgrade [Problem] I cant upgrade my prestashop to 1.7.2 to 1.7.4.2 with 1 click upgrade

[Dennis95]

Hello,

im trying to use this pluginj to update my prestashop site to last version on 1.7.4.2 from 1.7.2 cause i'm experiencing visual errors.

When i click the upgrade button nothing is in progress, i only see this error: 

PrestaShop Original version:
  Error: Unable to check md5 files

Differences between versions:

Can you help me? I attach all screens

 

Best regards

[Avinci22]

i'm not seeing any way here to associate a price with a customization as there are no hooks or methods in core classes to save the price.