The above Error code 30015-11 primarily appears when you try to open Office 365,2021,2019 program on a Windows 11 and windows10 computers . It has been observe that this Error code 30015-11 needs to repair or a reinstall and you can read the below information for more knowledge.
Disclaimers: Fixing an Error code 30015-11on Office program deals with your documents, emails, spreadsheets, and presentations. Please backup your data before you proceed. If you are not sure about the procedure, contact the technician for the support.

Issue type: Microsoft Office Installation Error Code 30015-11
How to do disc-cleanup :-
Method-1 Creating shortcut :
Watch this video to follow above steps for a disc cleanup.
Method-2:
It takes some time if the computer have too many junk files to clean up.
1. The first attempt is to check if there is any previously installed program with the same version.
That needs to be removed and then the installation should be commenced from the beginning.
2. If we don’t see any previously installed similar programs, it is recommended to run a network check through the command line.
The command prompt should be opened using the administrative permissions and then network command which needs to be execute as follows.
Nslookup office365.com
Similarly, irrespective of the version of your office Installation program, it is a very common line to check the status of your previously install Office program.
The server name should not show you as unknown.
3. If the server name is shown as unknown, restart your router or the modem and execute the same steps again.
4. If the server check passes correctly, then use the other setup file which is related to 64 bit from advanced steps under Microsoft office setup file.
5. If the Error code30015-11, still appears after the Office installation, attempt to repair the office Installation programs.
6. If the Microsoft Office repair fails again with some Error code 30015-11, a reinstallation of Office Program is required.
7. If the Microsoft Office repair succeeds and you still see the same Error code 30015-11, then perform a system file SFC/Scan on your windows using the following steps.
How To Do an SFC Scan:-
This Video Shows How to do SFC Scan.
Finally,

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More Issues to Error Code 30015-11 in Office 365, 2010/2013
Error code 800f0900, Error code 0xc004f200, Error code 0xc1900200, Error code error 0x8e5e03fb, Error code 0x80073701, Error code 0x8e5e03fb, Error code kb4012215, Error code 0x80073712, Error code kb3176936, Error code 0x80240fff, Error code 0x80070057, Error code kb4013198, Error code kb4012219, Error code 0x800706d9, Error code 80244022, Error code 800736cc, Error code Kb2919442, Error code 0x80070490, Error code 0x80240190xc190020e, Windows Update Error Code 0xc190020e, Windows Update Error 0xc190020e, fehlercode 0xc190020e, Errore 0xc190020e
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