Concerning JomSocial 1.8, YES
Concerning Kunena 1.6 they have changed the table name they are using and we will add the new definition in a next release. , normally YES - the latest that we retested was 1.5
In the meantime, you can re-install the extension directlry in the slave site.
There is no limit to have the update on a same version of a product. For example all the JMS 1.2.x.
So as long as we do not create a new JMS 1.3.x, you can update it.
Concerning the upgrade (ie 1.2.x to 1.3.x) you will have to buy the new version. When we release a new version of a product, we send email with discount coupon to give the customer upgrade with a lower price.
We have several products that are updated for more than 1 year (ie. JMS Multisites, Article Sharing)
The free support is provided from this public forum.
If you want specific support, you can order it at
www.jms2win.com/download?page=shop.produ...35&category_id=1
You can test if your hosting provide give you the permission to use the Symbolic Link functinoaliity.
See our tutorial video 7 that show how to test that.
www.jms2win.com/tutorial#jms12x-7
If you are using Plesk or Direct Admin, this might be more difficult the setup you Admin Tool to give permission to Symbolic Links.