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There appears to be a problem with the latest versions of Acrobat Reader 2021.001.20135 and 2021.001.20138 which causes Ftax forms to run slowly at times, or not to respond.
If you install a previous version of Acrobat Reader, this problem will be overcome.
To install a previous version (Windows users):
First, uninstall your current version of Acrobat Reader.
1. Click the start menu and right click Acrobat Reader DC.
2. From the menu that pops up, select Uninstall to access the Programs and Features control panel.
3. Select Adobe Acrobat Reader DC from the list of programs and click Uninstall from the top to start the uninstall process.
4. Follow the windows prompts until the software uninstalls.
Second, Download and install a previous version of Acrobat Reader from Adobe.
1. Open a Windows Explorer/File Explorer window (press Win+E).
2. Click to select the Address bar.
If the Address bar isn’t visible in Windows XP, choose View > Address Bar
3. In the address bar type the address of Adobe’s software storage:
ftp://ftp.adobe.com/pub/adobe/reader/win/
for windows, or
ftp://ftp.adobe.com/pub/adobe/reader/mac/
for mac, and press enter.

Note: This is a Windows Explorer/File Explorer window not a browser window.
4. You should be presented with a file structure of previous versions of Reader.
We have identified that the problem does not occur if you use AcrobatDC 2001320064.
If you wish to download and install this version, open the ReaderDC folder, then open the 2001320064 folder and copy the file AcroRdrDC2001320064_en_US.exe to your computer by dragging it onto your desktop (or other location). This is the english language version, other versions are available.
5. Once the file is downloaded onto your computer, double click the file to start the installation, and follow the Adobe prompts.
Don’t forget, you will need to follow the setup checklist again with your new software:
What should I check before using Ftax? (Ftax Setup Checklist)
If Acrobat Reader updates to the latest version and Adobe have not fixed this problem, you will need to follow this process again.
If you have any problems uninstalling Acrobat Reader, Adobe have produced a tool called AcroCleaner to help:
https://www.adobe.com/devnet-docs/acrobatetk/tools/Labs/cleaner.html