That's a profound complaint, ... but obviously it is the main purpose of MQS to do so.
The cause could be accidental misuse or damage.
To distinguish between these two possibilities a more detailed description of your problem would be necessary.
MQS quickstart-guide says actual sw-version is 1.2p.
With default-configuration MQS has a DHCPd enabled on it's wireless interface ... try these steps.
-connect your PC with a wired internet-connection via ethernet and open a CMD-window with administrative rights
-check internet-connectivity with
-after that connect addionally with the MQS-wireless-network "RBMQS" - it should give a 192.168.88.x-address
-try to open MQS-webinterface http://192.168.88.3
-on CMD-window check your PC's default-route
if there is a default route to the MQS-address 192.168.88.3 ... like that:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.88.3 192.168.88.x 25
... delete default-route to MQS with
route delete 0.0.0.0 mask 0.0.0.0 192.168.88.3
-after that check if you are still able to ping www.mikrotik.com
and MQS-address 192.168.88.3
-retry the “Check for updates”-button on MQS-webinterface