RFA .NET 7.5 is already in activate obsolescence and should be replaced by RFA .NET 8.0 until end of the year. Is it correct that the 32-bit support has been dropped in version 8.0, so that only 64-bit applications could be build?
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Yes, this is correct. In README file for RFA.NET 8.0 please find:
NOTES: - This release supports only 64-bit platforms.
Did you try 8.1.0.L1 version. It seems support 32 bit.
RDC Support query for CITIC Bank
Embed RFA in 32bit .Net addin