My WordPress site suddenly cannot instal any of the latest plugins

I am unable to install any of the latest versions of plugins actually on the site, or any new plugins. The message is:-
Could not create directory. /home/toymas/public_html/infomarketingdailyreport.com/wp-content/upgrade/google-affiliate-network.tmp/google-affiliate-network

This is happening to any plugin I try to install on my site, or any plugin that needs upgrading. It is only recently, since I upgraded to the latest version. I don’t think it has anything to do with the upgrading to the latest version, because I have another site using the same WordPress theme and version, and I uploaded the google affiliate plugin successfully.
Please can you help me get this put right – I will be very grateful