I have change back line in .csproj file to:
Another cause can be that the import statement in the csproj file has been changed back to
<Import Condition="Exists('$(MSBuildExtensionsPath)\OpenAccess.targets')" Project="$(MSBuildExtensionsPath)\OpenAccess.targets" />
and it is working now but I think it is taking file from install directory and not from project. What I did to chek it was:
1. Change line in OpenAccess.targets file inside "OpenAccessAssemblies" dir in project
from: <EnhancerAssembly Condition="'$(EnhancerAssembly)'==''">enhancer.exe</EnhancerAssembly>
to: <EnhancerAssembly Condition="'$(EnhancerAssembly)'==''">enhanc3er.exe</EnhancerAssembly>
2. Close solution
3. Restart VS
4. Open project
5. Edit .rlinq
Everythign was OK (I did not get error that there is no enhanc3er.exe).
I just want to make sure that when I install new version I will still be able to compile my old projects with old version (from OpenAccessAssemblies directory inside project).