You are mixing versions. If SLP is on 4.9 , Power and Premier need to be on 4.9. Or you can opt to downgrade SLP to earlier version and wait for the SLP and Power 4.9.1 patch to come out later this weekend
When there is a major version change the add-ons will not auto update. Also when WP has a major version release like they just did, they are inundated with auto update requests. They then regenerate and look for updates every 12 hours. There are thousands of themes, plugins and by the time they get to add-ons and may never get to ours. There method is to start alphabetically and then premium, and there own plugins, and their premier owned plugins like Woocommerce , and then they may get to the SLP add-ons.
This has been by design as there are known conflicts with some users if they have PHP version <5.4 and if attempting to add Power 4.9 it will crash their site.
If you want to update Power and Premier you must download them from your account manually.