Ok, I found what appears to be the replacement in the plugins section, however, I get "There is already an object named 'ShippingByWeight' in the database." error message. I'll see if I can delete it manually
Tried deleting the file "InstalledPlugins.txt" file completely. When loading the plugins in the Admin section, everything was disabled, however, attempting to install the Manual (Fixed or by Weight) plugin, it, again, failed with "There is already an object named 'ShippingByWeight' in the database." error.
I'm thinking this may be a new bug, but want to be sure before posting it to the BUGs forum.
I presume you haven't seen the "Readme.txt" file durign the upgrade:
7. Combine "Fixed Rate Shipping" and "Shipping by weight" plugins into single one. Upgrade instructions: do not forget to manually delete "/Plugins/Shipping.FixedRateShipping" and "/Plugins/Shipping.ByWeight" directories (they are not used anymore) and replace the plugin «Shipping.Fixed Rate» or «Shipping.ByWeight» by the plugin «Shipping.FixedOrByWeight» in the App_Data/InstalledPlugins.txt file.
I have done the same mistake of beefydog. But when I have correctly upgraded I have lost all my shipping datas (luckly I was testing in a "test site") But I'm frightened to loose all the datas when we will upgrade in the production site. Anyone has any idea what I have done wrong? :-)