3605238 - IS_SELECT phase hang with option "UPG WITH SAINT PACK"

In IS_SELECT phase, selected option "UPG WITH SAINT PACK" for 3rd party addon, then click "Next" button but hang without moving.

      |Selected  |Add-On    |Source Release  |Target Release  |Status                          |Note    |
  ---+----------+-----------+-----------------+-----------------+--------------------------+--------+
     1|X            |CGS        |220_702           |220_751H        |UPG WITH SAINT PACK  |632429  |

=========== Decision About Add-On CGS ===========
01)  *  Upgrade the add-on using SAINT package.
02)  -  Delete the add-on actively using SAINT package.
Select the operation that shall be executed:: Upgrade the add-on using SAINT package.

*Here addon "CGS" is an example, the issue could happen to other addons as well.

SAP system based on AS ABAP

IS_SELECT, UPG WITH SAINT PACK, Add-on phase, installation package, ACP package, SUM phase, SAINT, SPAM, Upgrade the add-on using SAINT package, Decision  , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem