Unable to install easyreservations 3.4.2 on WP 3.9.1

Hello,
anyone knows about the problem with easyreservations installation? I’m unable to install it, I tried on my two WP sites.
1. If I upload it manually via FTP, it does not show on plugins list – so nothing happens.
2. If I go to ‘Add new’ plugin and select ‘Upload’ zip file from my hard drive, it installs correctly but upon activation error is: The plugin does not have a valid header. (the issue is not folder inside folder, or zip inside zip, I’ve checked that).
3. If go to ‘Add new’ plugin and search plugin by name and select Install, the error is: The package could not be installed. No valid plugins were found. Plugin install failed.

Any help on this?

Thank you.

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