Hello.
The doc says "Before version 0.8, IndustrialCraft 2's Energy Units (EU) can be converted to RF through the LV Wire Connector, and RF can also be converted to EU. Attaching the LV Wire Connector to an appropriate side of an EU-accepting or outputting block will allow the block to convert it automatically: 4 RF will convert to 1 EU, and 0.25 EU will convert to 1 RF."
My question is: after 0.8 how to convert RF to EU ?
You don't. IE no longer acts as a power conversion mod.
You may find this thread to contain relevant reasoning as to why this is the case
RF to EU conversion was removed due to balance issues. It won't return.
Most helpful comment
RF to EU conversion was removed due to balance issues. It won't return.