[Win10] Razer Synapse (3 OR 2) failing to run.

Sorry if this is a well-known issue that has a fix posted elsewhere; I scanned the forum a bit to see if I could find anything but that was fruitless.

As the title says, I haven't been able to run any kind of Razer Synapse programme. I use a Razer Cynosa Chroma keyboard and a Razer Naga Chroma mouse.

I last updated Synapse a few days ago and following that Synapse seemed to have disappeared from my start menu and my desktop shortcuts would not work. (I restarted my computer to enable the update when I thought I saw Razer Central prompt me to, it seemed to have finished updating.)I tried to reinstall Synapse 3, which seemed to work but it would not run. (I also installed Razer Cortex at the same time, which worked fine.)

Following that, I tried to delete all traces of Razer software and reinstall it, but once again a reinstalled Synapse would not run.

I tried again to remove all traces of Razer software and even deleted the device drivers, reinstalling Synapse but to no avail.

Throughout all of this, Razer Central has worked fine.

I think I've done everything I could try to fix it myself; is there something I'm missing? Does anyone have any ideas on how to fix this?
Thank you.