When installing the library corresponding to .NET 3.5, I got the message:
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dotnet 20sp2 (Manual DL link broken)
http://download.microsoft.com/download/c/6/e/c6e88215-0178-4c6c-b5f3-158ff77b1f38/NetFx20SP_x86.exe
Local: 21701848c9559c48db9bf49ac06ba383
Server: c64fd1f972822ed84378c7058fea0744
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(I am sure I selected the DotNet 3.5 library, even if the above message refers to the DotNet 2.0). This error has beenn already reported in https://www.playonlinux.com/en/topic-17702-library_install_error_.html.
As mentioned in the Wiki page "Troubleshooting commom problems", this seems to be related to conflicting MD5 sums between the POL script and the downloaded package. I will greatly appreciate if you can fix this.