Software installation is not required if you are able to install the software yourself.
Support subscriptions are billed monthly or yearly depending on your requirements.
Any new features not mentioned in the base spec will be billed at £25 + £10 p/h. This, however, can change depending on certain conditions.
Minor and major bug fixes are included in your support subscription. This also includes updates.
Inopulse UK will charge you based on what requirements are. Please allow at least £5 increase in software development fees per hour depending on how complex the software is.