無法安裝，因爲此產品的較新版本已安裝

Question

我有一個用VS2010編寫的安裝項目。用戶啓動軟件包，填寫所有表單，進入最後一個「安裝」按鈕，點擊它並獲得「無法安裝，因爲已經安裝了該產品的較新版本。」 。這很奇怪，因爲在顯示任何對話框表單之前，安裝程序包總是會警告已安裝的版本。這個錯誤的可能原因是什麼？ 這可能是因爲有另一個產品安裝了相同的升級代碼，但具有不同的產品代碼？ 日誌低於：

Action 10:03:20: AppSearch. Searching for installed applications 
Action start 10:03:20: AppSearch. 
Action ended 10:03:20: AppSearch. Return value 0. 
Action 10:03:20: FindRelatedProducts. Searching for related applications 
Action start 10:03:20: FindRelatedProducts. 
Action ended 10:03:20: FindRelatedProducts. Return value 0. 
Action 10:03:20: ERRCA_CANCELNEWERVERSION. 
Action start 10:03:20: ERRCA_CANCELNEWERVERSION. 
DEBUG: Error 2835: The control ErrorIcon was not found on dialog ErrorDialog 
The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2835. The arguments are: ErrorIcon, ErrorDialog, 
Unable to install because a newer version of this product is already installed. 
MSI (s) (E8:B4) [10:03:27:248]: Product: Contact Manager -- Unable to install because a newer version of this product is already installed. 
Action ended 10:03:27: ERRCA_CANCELNEWERVERSION. Return value 3. 
Action ended 10:03:27: INSTALL. Return value 3. 

Answer 1

是的，沒錯 - 你有相同的產品安裝（與升級代碼），而是從早期版本。您需要卸載「更新」的版本。