Here I want to downgrade my Rpd from 220.127.116.11.6 to 18.104.22.168.0. If you want to downgrade Rpd Version from 320 to 308 also, you can follow the below steps.
Open below path of higher version:
D:\Oracle Business Intelligence Enterprise Edition Plus Client\oraclebi\orahome\bifoundation\server\bin
Please keep ur rpd in one path, example E:\ OKS1166.rpd
Then u want to put the higher version Bin location in Command prompt.(Not lower version)
Even Rpd (which Prd is going to open and where u r going to Save) path also not mind in Command prompt at Input and Out put locations ( -I E:\ OKS1166.rpd –O E:\OKS115.rpd) if u are place the higher version rpd in Higher version Bin Location.
D:\Oracle Business Intelligence Enterprise Edition PlusClient \oraclebi\orahome\bifoundation\ server\bin>nqgenoldverrpd.exe –P Admin123 –I E:\OldVersion.rpd –O E:\NewVersion.rpd –V 308
No Need to give Rpd path if Input file is already in required RPD Version BIN Directory.