System.AggregateException: Um ou mais erros. ---> System.IO.IOException: O processo não pode acessar o arquivo 'C:\Users\Motion\Downloads\PROClient_64 (3)\PROClient\PROClient_Data\data.unity3d.new' porque ele está sendo usado por outro processo.
   em System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   em System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   em System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
   em System.IO.File.OpenRead(String path)
   em ClientPatcher.Form1.<>c__DisplayClass14_0.<Stage1>b__0(PatchManifest entry, ParallelLoopState state) na U:\source\source\ClientPatcher\ClientPatcher\Form1.cs:linha 257
   em System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
   em System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   em System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>)
   --- Fim do rastreamento de pilha de exceções internas ---
   em System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   em System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   em System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
   em System.Threading.Tasks.Parallel.ForEachWorker[TSource,TLocal](IEnumerable`1 source, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Action`3 bodyWithStateAndIndex, Func`4 bodyWithStateAndLocal, Func`5 bodyWithEverything, Func`1 localInit, Action`1 localFinally)
   em System.Threading.Tasks.Parallel.ForEach[TSource](IEnumerable`1 source, Action`2 body)
   em ClientPatcher.Form1.Stage1() na U:\source\source\ClientPatcher\ClientPatcher\Form1.cs:linha 218
   em ClientPatcher.Form1.ExceptionWrapper() na U:\source\source\ClientPatcher\ClientPatcher\Form1.cs:linha 79
---> (Exceção Interna N° 0) System.IO.IOException: O processo não pode acessar o arquivo 'C:\Users\Motion\Downloads\PROClient_64 (3)\PROClient\PROClient_Data\data.unity3d.new' porque ele está sendo usado por outro processo.
   em System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   em System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   em System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
   em System.IO.File.OpenRead(String path)
   em ClientPatcher.Form1.<>c__DisplayClass14_0.<Stage1>b__0(PatchManifest entry, ParallelLoopState state) na U:\source\source\ClientPatcher\ClientPatcher\Form1.cs:linha 257
   em System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
   em System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
   em System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>)<---

Um ou mais erros.
mscorlib
Void ThrowIfExceptional(Boolean)
   em System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   em System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   em System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
   em System.Threading.Tasks.Parallel.ForEachWorker[TSource,TLocal](IEnumerable`1 source, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Action`3 bodyWithStateAndIndex, Func`4 bodyWithStateAndLocal, Func`5 bodyWithEverything, Func`1 localInit, Action`1 localFinally)
   em System.Threading.Tasks.Parallel.ForEach[TSource](IEnumerable`1 source, Action`2 body)
   em ClientPatcher.Form1.Stage1() na U:\source\source\ClientPatcher\ClientPatcher\Form1.cs:linha 218
   em ClientPatcher.Form1.ExceptionWrapper() na U:\source\source\ClientPatcher\ClientPatcher\Form1.cs:linha 79