問題：在win10系統中安裝VisaulSVN遇到問題，錯誤提示：There is problem with this Windows Installer package. A DLL required for this to complete could not be run. Contact your support personnel or package vendor.
As followed:
解決辦法：
別人有遇到這樣類似的問題，但不是針對同一個軟件安裝，他們給出的答案如下：
Windows Installer tried to execute a custom action located in a DLL.
Those .tmp files: C:\Users\x\AppData\Local\Temp\xxx.tmp and C:\Users\x\AppData\Local\Temp\xxx.tmp are really DLL files extracted from the MSI.
But for some reason it failed to load the DLL.
The most important thing is to find out which DLL is missing. While the error message is on screen, go to your temp directory and see if the temp DLL file still exists. If it is there, copy it with DLL extension. Then to find out which DLL of the required ones is missing, you can use depends.exe utility from Visual Studio.
If the temp file is already removed, the only way to get the DLL is to extract it from the package.
我也按照這種方法試驗了一下，賦予了C:\Users\x\AppData\Local\Temp Everyone完全控制的權限，雖然這里面有些文件是不允許修改權限的，但是這樣操作后，我再次安裝軟件成功了。或許這樣做不是最好的，但當你遇到類似問題卻不知如何下手時，這種方案或許你可以嘗試一下。