Goodness - you're being a bit unreasonable. First the default template will work and it is in your installation you just need to change your template to that. And yes, I understand that is not the template format you -prefer - but it is quick way to keep your site in the production (public) available for sales.
Are you sure there are not current files for your Furniture template - as I replied on one of your many other posts regarding this - please log into your downloads and see if there is a version for 1.1.2 - the description there indicates there should be.
Next - as the administrator of your site - YOU are reasonable for determining if any extension(a) you have purchased or enabled on your site have a version that is compatible for the cart version you are intending to run. This is beyond the scope of any cart - admins add all types of things to their sites - admins are ultimately responsible to see if everything is compatible. That is why it is STRONGLY recommended that you run a test on a non-production site PRIOR to updating your production (public) site.
I do understand your frustration, but you must be fair in your assessment that you have been lax in doing things that insure your site works correctly with all your choices PRIOR to updating a working site.
I have responded on one of your other posts regarding this issue on how you might be able to "roll-back"