Any other way to install plugin?

[ChrisPAR]

To answer the question of your title: yes, there is another way to install plugins, and it is documented here:

How to upload big files / archives

InfinityFree has a file size limit of 10 MB on all servers. You cannot upload files larger than 10 MB. Installing large scripts A particular software package may be larger than 10 MB in size. Because of this limit, you cannot upload the archive directly and have it extracted on the server. However, you can easily upload the contents manually. To do so, you will first need a good FTP file manager for your desktop and setup an FTP connection. See the how to upload files with FTP article for more…