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Can you install any other package extension on your site? The "JInstaller: :Install: Can't find XML setup file." line hints that there is a problem with your temp-directory being unwritable or something deleting its contents while an installation is in progress.

Please try installing the exact same package (pkg_admintools-7.9.1-pro.zip) a second time, immediately, without uninstalling anything in between. Occasionally Joomla's own extension installer fails to copy some files or folders during the first attempt; repeating the installation forces it to copy whatever was missing and commonly resolves exactly this kind of error.

If the second attempt still fails with the same error, please ask your host (Krystal) to check, at the time you attempt the install:

• The PHP max_execution_time and memory_limit values for your account
• The PHP upload_max_filesize and post_max_size values for your account, if you are uploading the ZIP file through the browser (Extensions: Install) rather than installing it from a folder on the server
• Whether any server-side error (PHP fatal error, timeout, out-of-memory kill, etc.) is logged at that moment

Since a smaller extension (Sourcerer) installs fine but the much larger Admin Tools package does not, this points to something interrupting the copy/extraction of the larger package specifically, rather than a general permissions problem.

Installing and updating a Joomla extension is handled entirely by Joomla's own installer, not by our code, so we can't fix this on our end — only work around it.

Technical information

The error you're seeing:

JInstaller: :Install: Can't find XML setup file.
JInstaller: :Install: Error SQL Table 'rawtoner_rtr-26.s0u1_admintools_filescache' doesn't exist
Extension installation stopped.
Package Install: There was an error installing an extension: com_admintools-pro.zip

happens when Joomla's package installer extracts the com_admintools-pro.zip sub-package contained inside pkg_admintools, but the extraction/copy is incomplete when Joomla tries to read its XML manifest. Because the manifest can't be read, the table-creation SQL for that component never runs, which is why you also see the "table doesn't exist" error immediately after. This is a known quirk of Joomla's own installer infrastructure with larger packages, not something specific to Admin Tools.