In general, you can find the patches for Tuxedo through MOS:
Tuxedo Patches Can Now Be Directly Downloaded Without Having To Open A Service Request (Doc ID 1075805.1)
Just go to the patches tab and search using the release=9.1 and the platform= Linux x86_64. The latest patch should be what you need.
The latest patch list for Tuxedo 9.1 document is here:
RP/TUX 9.1 - List of Rolling Patches - RP001 through RP163 (Doc ID 777942.1)
For Tuxedo 9.1 RP163 on Linux x86_64 the patch is from BUG 16049021. The patch file name is p16049021_91_Linux-x86-64.zip.
Just go to MOS and do a patch search using the bug number.
This worked for me:
Log into MOS (https://support.oracle.com)
Click on the "Patches & Updates" tab
Enter the bug number "16049021" into the "Patch Name or Number" field.
Click on the search button.
There will be only one patch listed in the "Patch Results"
Click on the "16049021" patch name.
Click on the download button
Where do you run into problems?
(If you do not have a current MOS account you will not be able to use any link that I would provide separately.)