All of the previous releases are here on sourceforge.
To fully recover your installation you have to own a database snapshot and data directory before you've started ANY upgrade process. Otherwise it will be hard to make it working properly.
To restore from such backup, just use the original release package, extract it, restore database into your sql server, put backed up data dir into fresh 1.3 installation (do not perform installation) and ajust database config in data/config.php if necessary.
However just to recover your contacts or companies you can peek into database (even now in the broken installation) into certain tables contact_data_1, company_data_1 and handle this data manually somehow to import into new EPESI - direct DB insert, import module or custom PHP scripts.
.htaccess file is not required to run EPESI - mostly it's for the security reason of data dir.
Good luck
