When installing the same installation package again, there will be three options: "Modify", "Repair" and "Delete". The same is true for copying the installation package, which is estimated to be based on judgments such as MD5.
After installing 1.7, install 1.8 and the prompt is as follows: The
prompt is as follows:
another version of this product has been installed. The installation of this version cannot continue. To configure or delete the existing version of this product, please use "Add/Remove Programs" on the "Control Panel".
After modifying the product name and version number of the Advanced Installer project, there is still this prompt.
After testing, due to the selection of "Uninstall previous versions
"
if: the update code is the same, the product code is different, then automatically uninstall 1.7 and install 1.8.
If: Both are different, install 1.7 and 1.8 at the same time.
If: the product code is the same, the update code is different. The result is the same as the product code and update code.
Product code update code
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Origin blog.csdn.net/he_zhidan/article/details/89335860
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