I still got back of them both but will not run now only will run with new version with errors. The changes have effected it and tax error comes up. Worse still under testing it worked fine and everything seemed ok after install, then it went bad. So not really alot you can do. You back everything up, you pre test then it starts developing faults. You switch back to backup and that now has "TAX" error Pretty much did everything right and sometimes thats not enough. So do not think fine, im backed up so will risk it, it may still bite u
I don't know how you did your previous version backup and how you reinstalled it, but I made an exact copy of my /prestashop directory, named it /save_prestashop and backed up the database. When the 1.4 upgrade failed, I deleted the /prestashop directory that held the 1.4 upgrade, deleted the upgraded database, created a new database, imported the 1.3 database and renamed /save_prestashop to /prestashop, tested it and everything worked as before. There's no reason it shouldn't, it's all the same as before.