PROBLEM: errors when trying to install in joomla Extensions->Install
It may be that your host has php set to only allow 2 Megs upload file size (the default when php is installed):
upload_max_filesize = 2M
I prefer to have:
upload_max_filesize = 64M
The install file is around 2.3 megabytes.
1) ask your host to increase the upload_max_filesize.
2) Unzip the package and upload by FTP to your tmp directory and tell Extensions->Install/Uninstall->Install from Directory
to use the tmp directory
3) upload your file by FTP to any directory, for example your main home directory, and tell Extensions->Install/Uninstall->Install from URL
to use http://www.mysite.com/com_mymuse-x.x.x.zip