I posted two Marketplace plugins above which if used on the latest version of IPS4 valid at this time, these plugins don't work - although their designers say they go on versions 4.3 !!! I had to give up on them (at least at first plugin).
In this case, IPS marketplace, like aliexpress.com, should ensure that the products published in this section comply with the latest requirements, otherwise users may spend some money for nothing !!! And it does not seem right to me !!!
I mean, someone who controls IPS Marketplace should check if plugins work, because those from IPS technical support have often faced certain errors caused by the up-to-date plug-in, for example, plugins that can work on version 4.3.0 but do not work on 4.3.6 and who buy 'plugins' has no way of knowing that !!!