Installation and Upgrade doesn't work

Hello,

I have the following problems and I am using online hoster 1&1.de with Joomla 1.5:
1.
if i try to Upgrade MJ it says "SERVER_CONNECT_FAILED, failed to open stream: no suitable wrapper could be found" i should upgrade it manually. Which leads to the 2nd problem...
2. When i try to install or upgrade manually it works whether fine but then there are some very strange menu point in the configuration window:" COM_MJ__INFORMATION...COM_MJ__CURRENT_VERSION...1.0 COM_MJ__LATEST_VERSION...1.0.1 COM_MJ__UPDATE ....COM_MJ__DEVICE_DATABASE_SIZE...25.25 MB " i think this isn't normal. The other thing, which occured a few times is that i get an error message wich says "blabla config file missing" or similar...

Can anybody help me?

COM_MJ-like messages mean that MJ language files wasn't installed correctly and you should reinstall MJ.

if i try to reinstall i get this:
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webadmin​@​kundenserver.de and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.



edit:
reinstalled from tmp.... same error but no language pack installed...

And what error_log contains?

i looked in the logs directory but haven't found an error_log

If your site is placed in /somepath/public_html, the look for error_log in
/somepath/public_html/administrator
/somepath/public_html
/somepath

still not found any solutions.... or the error log.... installes MJ 1.10 and still the same strange menu points ....