Helo,
It should not be too much longer until v.1.4 is released- that’s the best time frame I can give you.
It looks like you’ll have to manually update. Some installs have had this issue recently..
To manually update :
1. back up your site (optional safe measure)
2. download the latest Pro version from your account here: https://www.wcvendors.com/my-account/
3. deactivate & delete your current WC Vendors Pro (info is stored in your database…)
5. Immediately upload the Pro version 1.3.9 you downloaded from your my-account on here.
6. Activate! ?