Share several solutions that cannot be installed in. Net framework 4.0

Time：2020-11-6

[about. Net framework 4.0 installation failure]
————-Scheme 1:
http://www.win7xtzj.com/win10jiaocheng/39834.html
key word:
————-Scheme 2:
https://blog.csdn.net/xdhyqd/article/details/44745897
Keywords: rename the following files before installing
C:\Windows\System32\msvcr100_clr0400.dll
C:\Windows\SysWOW64\msvcr100_clr0400.dll

————-Scheme 3. If there is app.config If v4.0 is set in sku, adjust it

）Note:
Direct installation of 4.5, because. Net 4.5 is highly compatible with 4.0.. 360, computer housekeeper has
If it still doesn’t work, add the setting of scheme 3 above

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