Error in installation of OT Family Doctor

Hello,
I'm experiencing problem installing OT Family Doctor in my Joomla 2.5 site
Inside the template package i've found the file ot_familydoctor_template_installation.zip
When I try to install in the extension manager menu the following error is retuned:
Unable to find install package

Any other extension or template is installed without problem

My joomla installation version is 2.5.8
Can you help me ?
Many thanks
Sebastiano

I've found that the problem was caused by my installation of xampp in linux.
The problem was the default value of this two parameters
post_max_size = 2M
upload_max_filesize = 2M

These values are too low to allow the upload of the template
The appropriate values are:
post_max_size = 20M
upload_max_filesize = 20M


Hope this can help someone with the same problem
Sebastiano